Everyone yawns, yet the purpose of this body function is still somewhat of a mystery. People commonly yawn when they are tired or bored -- and when they see other people yawn. Excessive yawning, on the other hand, is not normal and can be a sign of a medical problem.

Bob Harper suffered a nearly-fatal heart attack in February. "The Biggest Loser" star admits that there were warning signs he ignored.

Indigestion (also known as stomach upset or dyspepsia) is a common problem that causes feelings of fullness and bloating during and after meals. Indigestion is usually caused by stress or eating too much too quickly, though it can sometimes be the result of another underlying health problem.

If you've recently had a heart attack, your life has already started to change--and many more changes need to happen in order for you to get healthy and reduce your risk of additional problems.

Caffeine can help you shake off lethargy and boost your attention levels, but using too much can result in some unpleasant side effects. In addition to coffee and tea, caffeine naturally occurs in the cocoa in dark and milk chocolate, and as an additive in soft drinks, energy drinks and coffee-flavored ice cream.

A heart attack, also called a myocardial infarction, occurs when blood supply is cut off to the heart muscle. This can be caused by a blood clot in an artery, an arterial spasm, trauma or other events. Heart attacks are uncommon in young men, but they can occur.

Numbness in your arms or hands can be caused by a variety of nerve or blood vessel conditions. However, some are more serious than others. Arm and hand numbness can be a sign of a heart attack -- a life-threatening condition. Seek immediate medical attention if you suspect you are having a heart attack.

Creatine phosphokinase, or CK or CPK, is an enzyme found in the brain, heart and skeletal muscles. A physician will commonly order a CPK test to determine whether a person has suffered a heart attack. There are different types of CPK and a physician uses this information to interpret abnormal results.

The effects of a mild heart attack can be vague and transient, or permanent, resulting in more severe side effects. Many patients do not realize they have had a heart attack until they see a doctor for unresolved vague symptoms.

Heart attacks are the leading cause of death in women older than 65. Heart attacks have a specific and documented set of symptoms. However, while these symptoms are well-documented and easily recognized, these were first documented in men.

A heart attack occurs when blood flow to the heart muscle is blocked long enough to damage the heart. Most heart attacks are caused by a blood clot in the coronary arteries. After having a heart attack, many people need to make significant changes to their lifestyles.

Numbness between the shoulder blades may signal a serious medical condition such as a heart attack or pinched nerve and should be treated as a medical emergency.