Hamstring origin tendinopathy is usually happening when there is an inflammation within the hamstring tendon. When performing an activity using the hamstring muscle and repeating that exercise, the tendon can lead to microscopic tears in it. For the body to repair the tendon, it begins an inflammatory response within the tendon calling it tendinopathy. When experiencing tendinopathy, the pain gradually increases as days go by. Typically signs of tendinopathy are ignored and recovers after a few days. But when you continue to do exercises and it gets worse, the pain will be present at all times and may interfere with your performance. This does not improve on its own and is highly recommended to see a sports physiotherapist. In the meantime, you should be icing the area as well as resting and stretching the hamstrings.