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Pulled Hamstring (cont.)

What Are Symptoms and Signs of a Pulled Hamstring (Hamstring Injury)?

The symptoms of a pulled hamstring depend upon the severity of the injury. Strains are described by how much damage occurs to the muscle and tendon fibers.

  • A grade 1 strain describes fibers that are stretched but not torn.
  • A grade 2 strain occurs if there is a partial tear of some of the muscle or tendon fibers.
  • A grade 3 strain describes the rare situation where there is complete tear or rupture of the muscle or tendon.

Muscles strains may occur over time as a result of overuse injury, or they may occur acutely with an abrupt specific injury. Moreover, there can be worsening of the severity of a hamstring pull if strenuous activity is attempted before the muscle has fully healed.

Muscle or tendon strains cause inflammation surrounding the injury site and symptoms include tenderness, pain, and swelling. Muscle spasm may also occur. Since muscles have excellent blood supply, a hamstring injury may cause bruising at the site of injury. After the injury, blood can ooze downward, pulled by gravity by gravity, so that bruising may be noted in the back of the knee or in the calf.

  • A grade 1 strain of the hamstring may be felt as a slight pull or ache in the back of the thigh. The exact injury may not be remembered or recognized, and onset of the pain may be gradual. There may be minimal swelling and a nonspecific pain when the knee is extended. A limp may or may not be present, but the pain is usually worsened with aggressive activity like running or walking up or down stairs.
  • Grade 2 strains often occur with an acute event, and an immediate sharp pain is felt in the back of the thigh or higher up toward the buttock. Walking may be difficult because extending the knee stretches the injured muscle, and a limp is often present. Swelling and tenderness can be appreciated at the area of injury.
  • Symptoms of a grade 3 strain are a progression of a grade 2 strain with symptoms of pain and swelling being more pronounced. Many times in athletic injuries, the muscle can be so aggressively stretched that it tears with a pop so loud that it can be heard by other players on the field. If there is a significant tear, a divot can sometimes be felt in the belly of the muscle at the site of injury.
Medically Reviewed by a Doctor on 12/11/2015

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