Vertigo dizzy sensation: a condition in which somebody feels a sensation of whirling or tilting that causes a loss of balance Vertigo, sensation of spinning around or of seeing nearby objects revolve. Vertigo tends to be accompanied by nausea, vomiting, headache, or sweating. Diseases of the cerebral cortex, eye muscles, or cerebellum can cause true vertigo, but such diseases are rare. Inflammation, infection, or other diseases of the semicircular canals of the inner ear, such as labyrinthitis (inflammation of the labyrinth), are more common causes and are frequently accompanied by auditory sensations, such as deafness and ringing in the ear (aural vertigo), and by rapid eye movements (nystagmus). These diseases generally last only a few weeks, during which the vertigo is usually experienced briefly and intermittently. Dysthymia depression with associated symptoms: persistent depression that has symptoms such as fatigue, low self-esteem, insomnia, and appetite disturbances but is not severe enough to amount to a psychosis Dysthymia is a chronic form of depression characterized by moods that are consistently low, but not as extreme as in other types of depression. Causes, incidence, and risk factors: The exact cause of dysthymia is unknown. Although the symptoms are not as severe as those of other forms of depression, affected people struggle nearly every day with low self-esteem, despair, and hopelessness. As with major depressive disorder, dysthymia occurs more frequently in women than in men and affects up to 5% of the general population. Dysthymia can occur alone or in conjunction with more severe depression or other mood or psychiatric disorder. chronic fatigue syndrome illness involving exhaustion and weakness: an illness without a known cause that is characterized by long-term exhaustion, muscle weakness, depression, and sleep disturbances. It may be a reaction to a viral infection in somebody already debilitated. Extreme, debilitating exhaustion is the hallmark of chronic fatigue syndrome (CFS). Those who have CFS sleep poorly and awake unrefreshed. They frequently have headaches, muscle and joint pain, sore throats, and problems concentrating and remembering things. The intensity and type of symptoms can vary from day to day. On a “good day” symptoms may be mild and someone with CFS may be able to function at a near normal level, but on a “bad day” they may be unable to get out of bed.