Left leg weakness can be caused by deep vein thrombosis, sciatica, stroke, or localized injury. Mild weakness isn’t usually concerning, but lasting weakness should be evaluated by a professional to rule out serious conditions and trigger necessary treatments.
There are several reasons why a person might experience weakness in their left leg, but three of the most common are deep vein thrombosis, which is a blood clotting problem; damage to the sciatic nerve; and stroke. Anyone who has injured their left leg or been involved in an injury, such as a car accident, may also experience weakness from time to time, particularly if there has been muscle damage or tears to any of the leg’s many ligaments. Mild or fleeting weakness isn’t usually something people should worry about, but experts usually recommend getting help when the condition appears to impair mobility or lasts for more than a few days. A medical checkup can rule out more serious conditions and can trigger any necessary treatments.
Deep vein thrombosis
It is usually quite notable for a person to experience pain in only one leg at a time. This usually only happens in response to specific stimuli or triggers. A condition that occurs most frequently in the left leg, and by extension is often responsible for left leg weakness, is deep vein thrombosis. This problem occurs when a blood clot forms in one of the veins in the leg and is generally considered to be very dangerous. The blood clot can travel through the vein to the lungs, causing an often fatal if not completely debilitating pulmonary embolism.
Sciatica and nerve damage
Sciatica and other back problems that cause spinal compression could also be to blame. The sciatic nerve runs from the lower back into each leg. When the nerve becomes irritated due to a spinal problem, it can lead to pain and weakness. Other symptoms of sciatica include pain and difficulty standing, sitting, or walking. Depending on the cause of your sciatica, it may go away on its own. In other cases, physical therapy, medications, or surgery may be needed.
Stroke
Another health problem that can cause left leg weakness is stroke. As with sciatica, weakness can occur to the right or left but is usually concentrated on only one side of the body. If the stroke affects the right side of the brain, weakness will occur in the left side. Weakness from a stroke can be felt in any part of the body, including the legs. A stroke occurs when blood flow to the brain is cut off and can cause permanent physical damage. Prompt medical attention is important if a stroke is suspected, and the quicker victims get help, the more likely they are to avoid permanent disability and other impairments.
Localized injury or trauma
Left leg weakness can also be caused by a leg, foot, or ankle injury. Muscle injuries due to sport or improper exercise are among the most common, but accidents and trauma can also be the causes. Some spinal injuries can also trigger problems with feeling or strength in one or both legs, depending on where the damage occurs. Injuries rooted in muscle or nerve damage often heal on their own over time, but not always. Sprains, strains, and minor pain usually go away within a week or so, but fractures and tissue damage often require medical attention and more specialized care to prevent further degeneration.
How to get help
Weakness that lasts for more than a few days is usually a cause for alarm, particularly if the cause isn’t immediately known. Health experts usually recommend that anyone bothered or concerned about their symptoms get a professional evaluation and checkup. This is especially important for anyone who suspects neurological damage or lasting nerve damage, as these injuries often get worse over time. Early diagnosis can help speed healing and prevent more serious consequences.
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