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Male impotence is also known as erectile dysfunction. It is a dysfunction of sexual ability of a person. In this condition a person has the inability to develop or maintain an erection of the penis sufficient for satisfactory sexual performance. To understand the causes and reasons for the impotence in males it is necessary to understand the mechanism of the erection.

sickle-cell anemia is a inherited blood disorder presenting in childhood characterized by red blood cells which become abnormal, rigid, sickle shape decreasing the cells' flexibility due to the mutations in the hemoglobulin gene causing decreased oxygen carrying capacity

Migraine headaches in children are common and are usually not serious, presenting as severe chronic daily headaches or stress related headaches located around the eyes, in the forehead region, or in the temples with sudden onset and accompanying symptoms of nausea, abdominal pain, vomiting, vision changes relieved by sleep which may be caused by an infection, high levels of stress or anxiety, or minor head trauma usually treated with over-the-counter pain medications and other lifestyle and home measures.

Motion sickness also called kinetosis is a condition with characteristic features of dizziness, fatigue and vomiting which occurs due to perceiving of different signals by eye and vestibular system in the ears seen commonly while travelling in vehicles, airplanes and space ships

The triad in the treatment of diabetes mellitus is dietary life style, exercise and antidiabetic medications. Exercise and diet modifications have a major role in control of blood sugar levels. Initially managed by increasing exercise and dietary life style modification, medications are typically needed as the disease progresses.