<unk>  or lack of strength is a direct term for the inability to exert force with ones muscles to the degree that would be expected given the individual's general physical fitness. The<unk>  may be caused due to affection in the muscle, nerve, or neuromuscular plate. Causes of<unk>  may be as varied as cardiovascular, chemical, dermatologic, drugs side effects, endocrine, environmental, gastroenterologic, genetic, hematologic, iatrogenic, infectious, musculoskeletal, neurologic, nutritional, oncologic,  overdose, psychiatric, and renal. A test of strength is often used during a diagnosis of a muscular disorder before the etiology can be identified. Many times, the cause of<unk>  may be identified with the history and physical examination; emg may guide into the type of<unk> , but other times biopsy or other laboratory test may be necessary.
Generalized weakness
Abnormal posturing
Myotonia
Hyperreflexia
Neuroglycopenia
Autonomic dysreflexia
Paraesthesia
Sensory ataxia