Rheumatoid arthritis is an autoimmune disorder that primarily affects the joints.

Insomnia, also known as sleeplessness, is a sleep disorder characterized by difficulty falling asleep, staying asleep, or experiencing non-restorative sleep.

Anemia is a medical condition characterized by a deficiency of red blood cells or hemoglobin in the blood.

Amblyopia, commonly referred to as "lazy eye," is a vision development disorder that typically begins in childhood.

A sprain and a spasm are two different medical conditions related to muscles and connective tissues, but they affect the body in distinct ways.