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sometimes you can aggravate a muscle injury if you've worked it too hard or injured it in the past but haven't allowed yourself time to heal completely. i get this sometimes in my biceps when i curl too often. it's just an intense soreness type of feeling when i put a load on the muscle.
a less common cause could be an overdevelopment of some muscle groups to the detriment of others. the imbalance sometimes from an over-developed hamstring muscle will hurt a less developed quad. this is uncommon, but is possible among athletes.
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If you will not fight when your victory will be sure and not too costly, you may come to the moment when you will have to fight with all the odds against you and only a precarious chance for survival. There may even be a worse case. You may have to fight when there is no hope of victory, because it is better to perish than to live as slaves.
~ Winston Churchill
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