Vitamin D deficiency is common and is associated with risk factors like older age, certain medical conditions, and decreased ...

Chest pain can be a sign of a heart attack or other cardiac condition, but it can also be a symptom of problems related to: respiration digestion bones and muscles other aspects of physical and mental ...

Déjà vu is a bit of a mystery. Experts aren’t sure what causes the sensation of having experienced something before, but they have some compelling theories. “Déjà vu” describes the uncanny sensation ...

A blackout refers to a loss of consciousness or complete or partial memory loss. Possible causes of blackouts include epilepsy and drinking a large volume of alcohol. Some causes of blackouts ...

Mast cell activation syndrome is a condition that causes mast cells to release an inappropriate amount of chemicals into your body. This causes allergy symptoms and a wide range of other symptoms.

You can develop back pain for many reasons, but some causes are more common than others. Wear and tear on the bones that form your spine (called vertebrae), muscles, and other tissues in your back can ...

Christy Bieber has a JD from UCLA School of Law and began her career as a college instructor and textbook author. She has been writing full time for over a decade with a focus on making financial and ...

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There are many theories about the causes of addiction, the use and abuse of legal and illegal psychoactive substances. Biology, psychology, and social and cultural elements all play a role in the ...

Possible causes of tongue bumps include injuries, allergies, and infections. Tongue bumps are usually harmless, but some indicate an underlying condition that needs medical treatment. Taste buds are ...

In 2016, children and adolescents (1 to 19 years of age) represented a quarter of the total estimated U.S. population 1; reflecting relatively good health, they accounted for less than 2% of all U.S.

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Michael Boyle is an experienced financial ...