After prolonged walking or intense exercise, muscles may become too tired to provide adequate support, causing the knee to suddenly lose strength.
Arthritis or other joint conditions can cause pain and stiffness, affecting knee stability.
Strains or sprains in muscles or ligaments may lead to sudden loss of knee support.
Low blood sugar levels can result in insufficient energy for muscle function, causing the knee to suddenly feel weak.
Wearing ill-fitting shoes, such as those that are too small or worn out, can lead to foot discomfort or injury, affecting knee stability.
Inner ear disorders or balance problems can cause the body to lose balance suddenly, making the knee feel weak.
Conditions like thyroid dysfunction, electrolyte imbalances, or cardiovascular diseases may also cause sudden knee weakness.