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Heartburn is a painful burning feeling in your chest or throat. It happens when stomach acid backs up into your esophagus, the tube that carries food from your mouth to your stomach.

If you have heartburn more than twice a week, you may have GERD. But you can have GERD without having heartburn.

Pregnancy, certain foods, alcohol, and some medications can bring on heartburn. Treating heartburn is important because over time reflux can damage the esophagus.

Over-the-counter medicines may help. If the heartburn continues, you may need prescription medicines or surgery.

If you have other symptoms such as crushing chest pain, it could be a heart attack. Get help immediately.

Your esophagus is the tube that carries food from your mouth to your stomach. Gastroesophageal reflux disease (GERD) happens when a muscle at the end of your esophagus does not close properly. This allows stomach contents to leak back, or reflux, into the esophagus and irritate it.

You may feel a burning in the chest or throat called heartburn. Sometimes, you can taste stomach fluid in the back of the mouth. If you have these symptoms more than twice a week, you may have GERD. You can also have GERD without having heartburn. Your symptoms could include a dry cough, asthma symptoms, or trouble swallowing.

Anyone, including infants and children, can have GERD. If not treated, it can lead to more serious health problems. In some cases, you might need medicines or surgery. However, many people can improve their symptoms by:

• Avoiding alcohol and spicy, fatty or acidic foods that trigger heartburn
• Eating smaller meals
• Not eating close to bedtime
• Losing weight if needed
• Wearing loose-fitting clothes

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Having a pain in your chest can be scary. It does not always mean that you are having a heart attack. There can be many other causes, including:

• Other heart problems, such as angina
• Panic attacks
• Digestive problems, such as heartburn or esophagus disorders
• Sore muscles
• Lung diseases, such as pneumonia, pleurisy, or pulmonary embolism
• Costochondritis - an inflammation of joints in your chest

Some of these problems can be serious. Get immediate medical care if you have chest pain that does not go away, crushing pain or pressure in the chest, or chest pain along with nausea, sweating, dizziness or shortness of breath. Treatment depends on the cause of the pain.

A hiatal hernia is a condition in which the upper part of your stomach bulges through an opening in your diaphragm. Your diaphragm is the thin muscle that separates your chest from your abdomen. Your diaphragm helps keep acid from coming up into your esophagus. When you have a hiatal hernia, it's easier for the acid to come up. This leaking of acid from your stomach into your esophagus is called GERD (gastroesophageal reflux disease). GERD may cause symptoms such as :

• Heartburn
• Problems swallowing
• A dry cough
• Bad breath
• Nausea and/or vomiting
• Breathing problems
• The wearing away of your teeth

Often, the cause of a hiatal hernia is unknown. It may have to do with weakness in the surrounding muscles. Sometimes the cause is an injury or a birth defect. Your risk of getting a hiatal hernia goes up as you age; they are common in people over age 50. You are also at higher risk if you have obesity or smoke.

People usually find out that they have a hiatal hernia when they are getting tests for GERD, heartburn, chest pain, or abdominal pain. The tests may be a chest x-ray, an x-ray with a barium swallow, or an upper endoscopy.

You don't need treatment if your hiatal hernia does not cause any symptoms or problems. If you do have symptoms, some lifestyle changes may help. They include eating small meals, avoiding certain foods, not smoking or drinking alcohol, and losing weight. Your health care provider may recommend antacids or other medicines. If these don't help, you may need surgery.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Your stomach is an organ between your esophagus and small intestine. It is where digestion of protein begins. The stomach has three tasks. It stores swallowed food. It mixes the food with stomach acids. Then it sends the mixture on to the small intestine.

Most people have a problem with their stomach at one time or another. Indigestion and heartburn are common problems. You can relieve some stomach problems with over-the-counter medicines and lifestyle changes, such as avoiding fatty foods or eating more slowly. Other problems like peptic ulcers or GERD require medical attention.

You should see a doctor if you have any of the following:

• Blood when you have a bowel movement
• Severe abdominal pain
• Heartburn not relieved by antacids
• Unintended weight loss
• Ongoing vomiting or diarrhea

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Caffeine is a bitter substance that occurs naturally in more than 60 plants including:

• Coffee beans
• Tea leaves
• Kola nuts, which are used to flavor soft drink colas
• Cacao pods, which are used to make chocolate products

There is also synthetic (man-made) caffeine, which is added to some medicines, foods, and drinks. For example, some pain relievers, cold medicines, and over-the-counter medicines for alertness contain synthetic caffeine. So do energy drinks and "energy-boosting" gums and snacks.

Most people consume caffeine from drinks. The amount of caffeine in different drinks can vary a lot, but it is generally:

• An 8-ounce cup of coffee: 95-200 mg
• A 12-ounce can of cola: 35-45 mg
• An 8-ounce energy drink: 70-100 mg
• An 8-ounce cup of tea: 14-60 mg

Caffeine has many effects on your body's metabolism. It:

• Stimulates your central nervous system, which can make you feel more awake and give you a boost of energy
• Is a diuretic, meaning that it helps your body get rid of extra salt and water by urinating more
• Increases the release of acid in your stomach, sometimes leading to an upset stomach or heartburn
• May interfere with the absorption of calcium in the body
• Increases your blood pressure

Within one hour of eating or drinking caffeine, it reaches its peak level in your blood. You may continue to feel the effects of caffeine for four to six hours.

For most people, it is not harmful to consume up to 400mg of caffeine a day. If you do eat or drink too much caffeine, it can cause health problems, such as:

• Restlessness and shakiness
• Insomnia
• Headaches
• Dizziness
• Fast heart rate
• Dehydration
• Anxiety
• Dependency, so you need to take more of it to get the same results

Some people are more sensitive to the effects of caffeine than others.

Energy drinks are beverages that have added caffeine. The amount of caffeine in energy drinks can vary widely, and sometimes the labels on the drinks do not give you the actual amount of caffeine in them. Energy drinks may also contain sugars, vitamins, herbs, and supplements.

Companies that make energy drinks claim that the drinks can increase alertness and improve physical and mental performance. This has helped make the drinks popular with American teens and young adults. There's limited data showing that energy drinks might temporarily improve alertness and physical endurance. There is not enough evidence to show that they enhance strength or power. But what we do know is that energy drinks can be dangerous because they have large amounts of caffeine. And since they have lots of sugar, they can contribute to weight gain and worsen diabetes.

Sometimes young people mix their energy drinks with alcohol. It is dangerous to combine alcohol and caffeine. Caffeine can interfere with your ability to recognize how drunk you are, which can lead you to drink more. This also makes you more likely to make bad decisions.

You should check with your health care provider about whether you should limit or avoid caffeine if you:

• Are pregnant, since caffeine passes through the placenta to your baby.
• Are breastfeeding, since a small amount of caffeine that you consume is passed along to your baby.
• Have sleep disorders, including insomnia.
• Have migraines or other chronic headaches.
• Have anxiety.
• Have GERD or ulcers.
• Have arrhythmia (a problem with the rate or rhythm of your heartbeat).
• Have high blood pressure.
• Take certain medicines or supplements, including stimulants, certain antibiotics, asthma medicines, and heart medicines. Check with your health care provider about whether there might be interactions between caffeine and any medicines and supplements that you take.
• Are a child or teen. Neither should have as much caffeine as adults. Children can be especially sensitive to the effects of caffeine.

If you have been consuming caffeine on a regular basis and then suddenly stop, you may have caffeine withdrawal. Symptoms can include:

• Headaches
• Drowsiness
• Irritability
• Nausea
• Trouble concentrating

These symptoms usually go away after a couple of days.

When you eat, your body breaks food down to a form it can use to build and nourish cells and provide energy. This process is called digestion.

Your digestive system is a series of hollow organs joined in a long, twisting tube. It runs from your mouth to your anus and includes your esophagus, stomach, and small and large intestines. Your liver, gallbladder and pancreas are also involved. They produce juices to help digestion.

There are many types of digestive disorders. The symptoms vary widely depending on the problem. In general, you should see your doctor if you have:

• Blood in your stool
• Changes in bowel habits
• Severe abdominal pain
• Unintentional weight loss
• Heartburn not relieved by antacids

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Eosinophilic esophagitis (EoE) is a chronic disease of the esophagus. Your esophagus is the muscular tube that carries food and liquids from your mouth to the stomach. If you have EoE, white blood cells called eosinophils build up in your esophagus. This causes damage and inflammation, which can cause pain, trouble swallowing, and food getting stuck in your throat.

EoE is rare. But because it is a newly recognized disease, it is being diagnosed more often. Some people who think that they have reflux (GERD) may actually have EoE.

Researchers are not certain about the exact cause of EoE. They think that it is an immune system/allergic reaction to foods or to substances in your environment, such as dust mites, animal dander, pollen, and molds. Certain genes may also play a role in EoE.

EoE can affect anyone, but it is more common in people who:

• Are male
• Have other allergic diseases, such as hay fever, eczema, asthma and food allergies
• Have family members with EoE

The most common symptoms of EoE can depend on your age.

In infants and toddlers::

• Feeding problems
• Vomiting
• Poor weight gain and growth
• Reflux that does not get better with medicines

In older children::

• Vomiting
• Abdominal pain
• Trouble swallowing, especially with solid foods
• Reflux that does not get better with medicines
• Poor appetite

In adults::

• Trouble swallowing, especially with solid foods
• Food getting stuck in the esophagus
• Reflux that does not get better with medicines
• Heartburn
• Chest pain

To find out if you have EoE, your doctor will likely:

• Ask about your symptoms and medical history. Since other conditions can have the same symptoms of EoE, it is important for your doctor to take a thorough history.
• Do an upper gastrointestinal (GI) endoscopy. An endoscope is a long, flexible tube with a light and camera at the end of it. Your doctor will run the endoscope down your esophagus and look at it. Some signs that you might have EoE include white spots, rings, narrowing, and inflammation in the esophagus. However, not everyone with EoE has those signs, and sometimes they can be signs of a different esophagus disorder.
• Do a biopsy. During the endoscopy, the doctor will take small tissue samples from your esophagus. The samples will be checked for a high number of eosinophils. This is the only way to make a diagnosis of EoE.
• Do other tests as needed. You may have blood tests to check for other conditions. If you do have EoE, you may have blood or other types of tests to check for specific allergies.

There is no cure for EoE. Treatments can manage your symptoms and prevent further damage. The two main types of treatments are medicines and diet.

Medicines used to treat EoE are:

• Steroids, which can help control inflammation. These are usually topical steroids, which you swallow either from an inhaler or as a liquid. Sometimes doctors prescribe oral steroids (pills) to treat people who have serious swallowing problems or weight loss.
• Acid suppressors such as proton pump inhibitors (PPIs), which may help with reflux symptoms and decrease inflammation.
• Monoclonal antibodies, which can reduce inflammation and may help with swallowing. They can be used in adults and children over age 12.

Dietary changes for EoE include:

• Elimination diet. If you are on an elimination diet, you stop eating and drinking certain foods and beverages for several weeks. If you are feeling better, you add the foods back to your diet one at a time. You have repeat endoscopies to see whether or not you are tolerating those foods. There are different types of elimination diets:
• With one type, you first have an allergy test. Then you stop eating and drinking the foods you are allergic to.
• For another type, you eliminate foods and drinks that commonly cause allergies, such as dairy products, egg, wheat, soy, peanuts, tree nuts and fish/shellfish.
• Elemental diet. With this diet, you stop eating and drinking all proteins. Instead, you drink an amino acid formula. Some people who do not like the taste of the formula use a feeding tube instead. If your symptoms and inflammation go away completely, you may be able to try adding foods back one at a time, to see whether you can tolerate them.

Which treatment your doctor suggests depends on different factors, including your age. Some people may use more than one kind of treatment. Researchers are still trying to understand EoE and how best to treat it.

If your treatment is not working well enough and you have narrowing of the esophagus, you may need dilation. This is a procedure to stretch the esophagus. This makes it easier for you to swallow.

The esophagus is the muscular tube that carries food and liquids from your mouth to the stomach. You may not be aware of your esophagus until you swallow something too large, too hot, or too cold. You may also notice it when something is wrong. You may feel pain or have trouble swallowing.

The most common problem with the esophagus is GERD (gastroesophageal reflux disease). With GERD, a muscle at the end of your esophagus does not close properly. This allows stomach contents to leak back, or reflux, into the esophagus and irritate it. Over time, GERD can cause damage to the esophagus.

Other problems include heartburn, cancer, and eosinophilic esophagitis. Doctors may use various tests to make a diagnosis. These include imaging tests, an upper endoscopy, and a biopsy.

Treatment depends on the problem. Some problems get better with over-the-counter medicines or changes in diet. Others may need prescription medicines or surgery.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Each year almost 800,000 Americans have a heart attack. A heart attack happens when blood flow to the heart suddenly becomes blocked. Without the blood coming in, the heart can't get oxygen. If not treated quickly, the heart muscle begins to die. But if you do get quick treatment, you may be able to prevent or limit damage to the heart muscle. That's why it's important to know the symptoms of a heart attack and call 911 if you or someone else is having them. You should call, even if you are not sure that it is a heart attack.

The most common symptoms in men and women are:

• Chest discomfort. It is often in center or left side of the chest. It usually lasts more than a few minutes. It may go away and come back. It can feel like pressure, squeezing, fullness, or pain. It also can feel like heartburn or indigestion.
• Shortness of breath. Sometimes this is your only symptom. You may get it before or during the chest discomfort. It can happen when you are resting or doing a little bit of physical activity.
• Discomfort in the upper body. You may feel pain or discomfort in one or both arms, the back, shoulders, neck, jaw, or upper part of the stomach.

You may also have other symptoms, such as nausea, vomiting, dizziness, and lightheadedness. You may break out in a cold sweat. Sometimes women will have different symptoms then men. For example, they are more likely to feel tired for no reason.

The most common cause of heart attacks is coronary artery disease (CAD). With CAD, there is a buildup of cholesterol and other material, called plaque, on their inner walls or the arteries. This is atherosclerosis. It can build up for years. Eventually an area of plaque can rupture (break open). A blood clot can form around the plaque and block the artery.

A less common cause of heart attack is a severe spasm (tightening) of a coronary artery. The spasm cuts off blood flow through the artery.

At the hospital, health care providers make a diagnosis based on your symptoms, blood tests, and different heart health tests. Treatments may include medicines and medical procedures such as coronary angioplasty. After a heart attack, cardiac rehabilitation and lifestyle changes can help you recover.

NIH: National Heart, Lung, and Blood Institute