Hamstring strain swelling

A sudden stretch or contraction can damage muscle fibres and small blood vessels. Fluid or blood may collect around the injured area, sometimes with bruising and tenderness. Swelling may appear in the back of the thigh and can spread lower as fluid tracks through the tissues. The amount of swelling does not by itself show the full severity, so function and examination matter. Read about related [Thigh Pain](/symptoms/thigh-pain/).

A clinician may ask how the injury occurred, check walking and knee movement, and compare strength with the other side. A large bruise, a dip in the muscle, or substantial weakness needs more careful evaluation.

Stop the activity that caused the pain and rest the leg from sprinting, jumping, and deep stretching. Elevate it when resting. A wrapped cold pack may ease discomfort for short periods; protect the skin and follow professional advice. Compression can help some people, but it should not cause tingling, colour change, or increased pain.

After the first phase, gentle movement within comfort helps prevent stiffness. Do not force a stretch through swelling or return to sport because the bruise looks better. A graded [Exercise Therapy](/treatments/physiotherapy-and-rehabilitation/exercise-therapy/) plan can rebuild strength while symptoms settle.

Seek prompt care for rapidly increasing swelling, extensive bruising, inability to walk normally, severe pain, a palpable gap, or sudden weakness. Urgent assessment is also needed for numbness, a cold or discoloured foot, or calf swelling with chest symptoms. If swelling is not settling or returns with ordinary activity, book an examination rather than repeatedly testing the muscle.

Ask where the injury is located, whether you need imaging, how to use compression safely, and which movements are suitable today. Ask when strengthening can start and how progress will be measured. Your clinician can discuss [Sports Physiotherapy](/treatments/physiotherapy-and-rehabilitation/sports-physiotherapy/) or a [Return-to-Sport Programme](/treatments/physiotherapy-and-rehabilitation/return-to-sport-programme/) if sport is part of your routine.