Neurological disorders, metabolic disorders, muscular disorders, injuries and excessive inflammation of muscles may cause muscle weakness, states Healthgrades. Blood conditions such as anemia and hypoglycemia may also result in muscle weakness.
Stroke, nerve entrapment or compression, Guillain-Barre syndrome, and Bell’s palsy, which is a swollen or inflamed nerve that controls facial muscles, are types of neurological conditions that can cause muscle weakness, notes Healthgrades. Other neurological causes include cerebral palsy, a genetic disorder known as Charcot-Marie-Tooth disease, and multiple sclerosis, a condition that damages the brain or spinal cord, causing weakness and difficulties in coordination and balancing.
Hypokalemia, which is a low potassium condition, hyperthyroidism, a low sodium condition known as hypernatremia and hyperparathroidism, which occurs due to over active parathyroid glands, are metabolic disorders that can trigger muscle weakness, explains Healthgrades. Addison's disease, which is a low production of certain hormones by adrenal glands, may also cause muscle weakness.
Muscular dystrophy, a genetic condition that causes loss of muscle tissues, and amyotrophic lateral sclerosis, which is a serious condition that weakens and disables the muscles, may lead to muscle weakness, according to Healthgrades. Poisoning of the muscles as a result of paralytic shellfish, insecticide ingestion, exposure to a nerve gas or botulism may cause this problem.