A typical bone in your body contains three types of tissue: a hard outer tissue, a sponge-like inner tissue, and smooth tissue at the ends.

Vision, hearing, and speech are an important part of your child's life. When an infant is born, their eyesight is immature. The infant later develops the ability to focus. Hearing appears early as a baby develops in its mother's uterus. Hearing is needed for correct speech and language development.

Cluster headaches are rare and cause severe pain that tends to recur in the same way each time. Cluster headaches occur in groups, or clusters, and each attack lasts about 1 to 3 hours on average.

Detailed information on kidney disorders

Prostatitis is inflammation of the prostate gland and sometimes the area around it. It is not cancer. Learn more about this condition, including what it is, what causes it, what the symptoms are, and how it's diagnosed and treated.

Detailed information on obesity surgical treatment, including gastric bypass surgery, and gastric stapling surgery

Detailed information on obesity, including obesity causes, obesity health effects, obesity medical treatment, obesity surgical treatment, maintaining weight loss, and obesity prevention

Shin splints refers to pain and tenderness along or just behind the large bone in the lower leg (the tibia).

Stress fractures are weak spots or small cracks in the bone caused by continuous overuse. They often occur in the foot after training for basketball, running, and other sports.

Patellofemoral pain syndrome means that you have dull pain around the front of the knee (patella). This is where the knee connects with the lower end of the thighbone (femur).