Attention Deficit Hyperactivity Disorder, or ADHD, affects 4 percent to 12 percent of American school-aged children, according to the American Academy of Pediatrics. Although ADHD is most commonly diagnosed after children enter school, most experts agree that the tendency to develop ADHD is already present at birth.

Head lice when left untreated multiply and spread when the lice fall on furniture, bedding and clothing. Lice also transfer through ordinary physical contact, including hugging.

Most open wounds heal spontaneously if kept clean and dry. Sometimes the use of topical medications such as peroxide or bacitracin may aid in wound healing. However, an open wound may easily become infected and require medical care. It's very important that you know the signs and symptoms of infection.

Heart palpitations have a variety of causes, including nutritional deficiencies, stress, heart disease, high blood pressure and allergic reactions, among others. Bananas are a good source of potassium, a primary electrolyte in your body essential for normal heart contraction and rhythm.

Underactive thyroid, or hypothyroidism, is a condition that commonly affects women in their 40s and 50s. Hypothyroidism can reduce your metabolism, making weight management and weight loss difficult without a healthy dietary lifestyle.

Urinary tract infections are very common bacterial infections that can affect men and women of all ages, although they are 10 times more common in women than in men, according to the University of Maryland Medical Center. These infections require the treatment of a physician.

Stomach bloating, also known as abdominal bloating, is a condition characterized by abnormal sensations of fullness or tightness in your stomach or abdomen. This condition has a number of potential causes, including weight gain, constipation, overeating and unconscious or habitual swallowing of air.

Blood clots typically occur in the large veins of the legs but also can form in the arms and upper body. Also called deep vein thrombosis, or DVT, blood clots prevent normal blood flow and can cause swelling and pain at the location of the clot.

You may feel tired after eating for several reasons, including being an undiagnosed diabetic. Keep a food and activity journal to help you and your doctor identify the cause of your fatigue.

Pain at the back of your ankle and heel during walking may indicate muscle tightness, tendinitis or ankle impingement syndrome. Your pain may be described as achy, sharp or stabbing and can be accompanied with swelling and joint stiffness.

Excess weight in the feet is contained right below the surface of the skin. In comparison to visceral fat, which forms around the organs in the stomach, this type of fat, called subcutaneous fat, is benign. Unfortunately, having chubby feet can still take its toll on self-esteem, especially during the summertime.

Kidney stones are clusters of crystals that form inside your kidneys. These stones can form when substances normally present in urine -- such as calcium, oxalate or uric acid -- become too concentrated.