Muscle weakness is commonly due to lack of exercise, ageing, muscle injury or pregnancy. It can also occur with long-term conditions such as diabetes or heart disease. There are many other possible causes, which include stroke, multiple sclerosis, depression, fibromyalgia and chronic fatigue syndrome (ME).

While a program of aerobic activity – brisk walking, jogging, swimming – may boost your energy level, the only way to strengthen muscles is through strength training or “resistance” exercise (in other words, weight lifting).

Many health conditions can cause muscle weakness. Examples include: neuromuscular disorders, such as muscular dystrophies, multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS) autoimmune diseases, such as Graves’ disease, myasthenia gravis, and Guillain-Barré syndrome.

Usual causes of arm weakness include injury to, or infection of, the arm; muscle wasting, such as from certain muscular disorders or from lack of use; nerve damage or compression at the vertebral column; or certain hereditary conditions.

Another common symptom of chronic anxiety is weakness in the muscles, most commonly experienced in the legs and sometimes the arms.

Chronic fatigue syndrome (CFS) is a condition that causes you to feel exhausted and weak, no matter how much rest or sleep you get. It often causes insomnia. Because your body doesn’t feel rested or replenished, CFS can also cause aches in the muscles and joints throughout your body.

WHAT CAUSES MUSCLE WEAKNESS IN THE MORNING? Muscles are innervated by nerves that originate in the brain and spinal cord. One possible explanation for muscle weakness in the morning is that nerves are not maximally “driving” muscles at this time of day.

If you wake up feeling weak, woozy, or unsteady, it can be a sign of anything from not getting enough to drink to a medical condition like sleep apnea. Learn the common causes of morning dizziness and how to manage those conditions.

Low blood sugar in the mornings, also known as morning hypoglycemia, can make people feel faint, light-headed, or confused when they wake up. Having low blood sugar in the mornings is common in people on medication for diabetes, though it can also happen for other reasons.

Causes. Tremors are caused by damage in your brain affecting the nerves that control your muscles. Internal vibrations are thought to stem from the same causes as tremors. The shaking may simply be too subtle to see.