Pain in leg below knee. It's paining.

Test of uric acid and vit d. Physiotherapy treatment must

It could be a meniscal injury better get it assessed, donot experiment with exercises that may cause potential damage put ice only to avoid any further aggravation. See some clinic.

Calf Stretches Standing calf stretch Stand away from a wall and.put your fight foot behind you and be sure your toes are facing forward. Lean forward at the ankle while bending the right knee and keeping your heel on the ground. Hold this for 30 to 60 seconds. Repeat 10 times a twice a day. Downward dog yoga stretch Get down on all fours with your hands under your shoulders on the floor. Walk your hands forward slightly on the floor. Spread your fingers apart to allow for a broad base of support. Push your hips up toward the ceiling and tighten your abdominal muscles. Keep your heels on the ground and gently try and straighten your knees. Repeat 10 times a twice a day. Wall calf stretch Stand about two feet away from a wall. Place the ball of your right foot against the wall while your heel remains on the ground. Slowly and gently lean into the wall while keeping your knee straight. Hold this for 5 seconds. Repeat 10 times twice a day. Downward dog yoga stretch Get down on all fours with your hands under your shoulders on the floor. Walk your hands forward slightly on the floor. Spread your fingers apart to allow for a broad base of support. Push your hips up toward the ceiling and tighten your abdominal muscles. Keep your heels on the ground and gently try and straighten your knees. Hold this for the 5 seconds. Repeat 10 times twice a day.

It can be due to any meniscal injury specially of you feel like your knee get locked while bending. Or it can be due to chondromalascia patella if there is any pain behind your knee cap.. It can be completely diagnosed only by an MRI. But you can consult a physiotherapist for proper assessment, diagnosis and treatment.

Go to a physiotherapist.. Ultrasonic therapy +IFT +Heating therapy +some strengthening exercises will be helpful for sure.

At home.. Rest +hot water fomentation +pain killer gel +no long standing /walking /stair climbing +no cold exposure +use knee supports/cap(elasticated) +no squatting /cross leg sitting.