Reduced muscle strength or lack of strength in the muscles is called muscle weakness. It can be of two types- true or perceived. Muscle weakness can cause symptoms like diplopia, difficulty in speaking and swallowing, memory loss, fever, lethargy, headache, numbness in the limbs and sudden weight loss. The usual causes can be metabolic causes such as Addison’s disease, hyper secretion of endocrine hormones, low sodium and potassium levels; neurological causes include cerebral palsy; etc.
HOW IS MUSCLE WEAKNESS DIAGNOSED?
The severity of muscle weakness is graded as 0- when there is no movement of the muscle, 1- there is trace of contraction, 2- joint movement with gravity eliminated, 3- movement against gravity, 4- movement against external resistance and 5- normal strength.