Most cases of diarrhea in toddlers are caused by viral infections. Bacteria, parasites, food allergies and medication side effects are other possible causes.

Up to 84 percent of people worldwide experience low back pain during their lifetime, according to the authors of a February 2012 review article published in the journal "Lancet." Sciatica is a common form of low back pain that often radiates into the legs.

Red bumps on or underneath the tongue can be alarming. At the very least, they are the result of eating too many acidic or sugary foods and at the most they could be a sign of disease. In most cases, these bumps are merely a nuisance. While they may be painful, they are likely to go away on their own within a few days.

Tingling pains in the foot can be a sign of serious disease or a precursor to long-term problems from something as easy to fix as changing your shoes.

Finding small red bumps on the bottom of your foot can be alarming. However, usually the cause of these bumps is a benign and treatable condition known as athlete's foot. Treatment consists of non-pharmacologic and pharmacologic measures and is relatively simple.

Metamucil is a fiber supplement available in many forms from drinkable liquids to capsules to wafers. Metamucil formulas come in original and sugar-free versions. According to the company website, Metamucil is the leading brand of fiber supplements recommended by doctors, pharmacists and gastroenterologists.

Sinus pain and postnasal drip are usually symptoms of sinusitis, which is an inflammation of the sinuses with frequent thick nasal secretions that drip back in the throat when the person lies down.

Fibromyalgia and multiple sclerosis are potentially debilitating disorders that lead to chronic pain. Fibromyalgia is characterized by muscle pain and stiffness, profound fatigue and difficulty sleeping.

With more than 30 million Americans suffering from congestion, decongestants are a popular over-the-counter medication, according to the Centers for Disease Control and Prevention. Pseudoephedrine, or Sudafed, and phenylephrine, or Sudafed PE, are the two most common oral decongestants available OTC.

Testosterone is the hormone our bodies produce that is responsible for our sex drive and our muscle mass. Its presence is greater in men than women and often results in aggressive behavior when the testosterone level is too high. As bad as having high testosterone can be, low testosterone is even more dangerous.

Like the nervous system, the endocrine system is involved in communication and control between the body’s various organ systems. Hormones are produced in the body by organs called glands which release hormones in order to send messages to other organs.

Calcium is vital for cells to function properly, and to strengthen bones and teeth. Hypocalcemia describes the condition of too-low blood calcium; it most often results when the body loses too much calcium through urine, or when the bones are not moving enough to the blood.