Chronic strains typically result from repetitive movement of the muscles and tendons over a long period of time.Degrees of Injury (as classified by the American College of Sports Medicine):
First degree (mildest) – little tissue tearing; mild tenderness; pain with full range of motion. Second degree – torn muscle or tendon tissues; painful, limited motion; possibly some swelling or depression at the spot of the injury. Third degree (most severe) – limited or no movement; severe acute pain, though sometimes painless straight after the initial injuryTo establish a uniform definition amongst healthcare providers, in 2012 a Consensus Statement on suggested new terminology and classification of muscle injuries was published.The classifications suggested were:

The major difference suggested was the use of "indirect" muscle injury verse "grade 1" to provide subclassifications when advanced images were negative.Indirect Muscle Injury
FUNCTIONAL (Negative MSK US & MRI)
Type 1: Overexertion-related Muscle Disorder
Type 1a: Fatigue induced
Type 1b: DOMS• Type 2: Neuromuscular muscle disorder

Type 2a: Spine-Related
Type 2b: Muscle-RelatedSTRUCTURAL MUSCLE INJURY (Positive MSK US & MRI)
• Type 3: Partial Muscle Tear
• Type 4: (Sub) total tear
DIRECT MUSCLE INJURY
•  Bump or Cut: Contact-related

Risk factors
Although strains are not restricted to athletes and can happen while doing everyday tasks, people who play sports are more at risk for developing a strain. It is common for an injury to develop when there is a sudden increase in duration, intensity, or frequency of an activity. Treatment
The first-line treatment for a muscular strain in the acute phase include five steps commonly known as P.R.I.C.E. Protection: Apply soft padding to minimize impact with objects.
After the bleeding has stopped, NSAIDs can be used with some effectiveness to reduce inflammation and pain.A new treatment for acute strains is the use of platelet rich plasma (PRP) injections which have been shown to accelerate recovery from non-surgical muscular injuries.It is recommended that the person injured should consult a medical provider if the injury is accompanied by severe pain, if the limb cannot be used, or if there is noticeable tenderness over an isolated spot. These can be signs of a broken or fractured bone, a sprain, or a complete muscle tear. See also
Achilles tendon rupture
Pulled hamstring
Repetitive strain injury

References


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