The left side of the waist sprained to the tendon can take the following measures: first, take a flat position, with a soft pillow pad on the back of the thigh, keep the hip flexed, knee flexed, the waist helps to relax, avoiding the location of the sprained to the tendon is strained and tension and lead to further aggravation of the injury. If you do need to stand, try to choose to use the right side for support, to allow the left side of the strained muscles to relax and rest, you can also take the state of bilateral knee flexion, so that the lumbar muscles can also relax, the stretch to the tendon situation has a better effect. Second, absolute attention to warmth, not to appear cold, because once cold will lead to the aggravation of local edema, resulting in increased pain symptoms, in 48h after the injury can be used to warm water bags to increase blood circulation, but also to relax the muscle tissue, help relieve symptoms and promote recovery. Third, the pain symptoms are very obvious, you can take oral Nimesulide, ibuprofen and other anti-inflammatory and analgesic drugs to relieve local pain symptoms and reduce inflammatory edema.