Leg weakness can be caused by a variety of medical conditions, some of which are serious. Possible causes include stroke, systemic diseases, inflammatory conditions, nerve damage, muscle disorders, and medication side effects.
People will often experience shaky or weak legs when dealing with vascular issues in the leg, like deep vein thrombosis or blood clots. Clots are very serious if untreated because they could break off into the bloodstream and travel to an artery in the lungs, blocking blood flow.
Muscle weakness in the legs may indicate a neuromuscular disease is present. These diseases lead to a loss of functioning in nerves and muscles throughout the body. They include muscular dystrophy, amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), myasthenia gravis and fibromyalgia.
If you suddenly feel weak, shaky, or lightheaded—or if you even faint—you could be experiencing hypoglycemia. A headache that comes on quickly, weakness or tremor in your arms or legs, and a slight trembling of your body are also signs that your blood sugar is too low.
The “jelly legs” feeling, which typically refers to feelings of weakness, dizziness, or loss of control in the legs, is often caused by a rush of adrenaline taking blood away from the legs, though there may be other causes.
Often, the cause of weakness or pain in the legs when walking is a narrowing of the space around nerves that carry signals to the lower part of the body. When symptoms affect your legs, the condition is typically lumbar spinal stenosis.
Muscle weakness due to vitamin D deficiency is predominantly of the proximal muscle groups and is manifested by a feeling of heaviness in the legs, tiring easily, and difficulty in mounting stairs and rising from a chair; the deficiency is reversible with supplementation (15–18).
As a result, people with heart failure often feel weak (especially in their arms and legs), tired and have difficulty performing ordinary activities such as walking, climbing stairs or carrying groceries.
However, tremors and other movement disorders are associated with vitamin deficiency, most vitamins B1, B6 and especially B12. B12 is very important for keeping your nervous system in good working order. Severe lack of Vitamin B12 is rare, but shakiness and tremors can occur even in mild deficiency.
Why do my legs feel weak when I'm nervous? When we're nervous, the body activates the fight or flight response, which causes a number of body-wide changes that give the body an emergency boost when in danger. This boost can affect the muscles in the legs, making them feel weak.
Warning signs and symptoms of heart failure include shortness of breath, chronic coughing or wheezing, swelling, fatigue, loss of appetite, and others. Heart failure means the heart has failed to pump the way it should in order to circulate oxygen-rich blood throughout the body.
Poor Blood Supply to Extremities
Poor blood supply to the legs may lead to: Pain, achiness, fatigue, burning, or discomfort in the muscles of your feet, calves, or thighs. Symptoms that often appear during walking or exercise, and go away after several minutes of rest.
Vitamin B12deficiency symptoms may include: strange sensations, numbness, or tingling in the hands, legs, or feet. difficulty walking (staggering, balance problems) anemia.
Vitamin D helps your body use calcium. But when you're deficient in this vitamin, your legs may feel weak, sore and heavy. A vitamin E deficiency may be another reason your legs feel heavy after a run.
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).
It is not uncommon to feel 'wobbly' or unsteady on your feet after sitting for a long period. It can be due to reduced blood flow, tight muscles and ligaments, fluid pooled in the body's lower extremities, or pins and needles sensations in the feet.
Abnormal sensations can be a common initial symptom of MS. This often takes the form of numbness or tingling in different parts of your body, such as the arms, legs or trunk, which typically spreads out over a few days.
Restless legs syndrome, also known as Willis-Ekbom disease, is a common condition of the nervous system that causes an overwhelming, irresistible urge to move the legs. It can also cause an unpleasant crawling or creeping sensation in the feet, calves and thighs. The sensation is often worse in the evening or at night.
What is weakness in MS? Weakness is a common symptom in multiple sclerosis. You may feel that you do not have enough strength or energy to move some or all of your limbs, or your whole body. Weakness and fatigue are closely linked and having one often makes the other symptoms worse.