The click is caused by the tensing of the chordae tendineae and the hammocking of the mitral valve leaflets. Your doctor may hear multiple clicks. Your chest x-ray will probably be normal unless you have severe mitral regurgitation. If you have chest pain or discomfort, your doctor may order some of these tests to rule out coronary artery disease. If you have mitral valve proplapse, you were probably born with the tendency and your condition may have worsened over time.
Dehydration can exacerbate the situation.
You cannot prevent mitral valve prolapse. or prevent it from worsening, but most often no treatment is needed and mitral valve prolapse remains mild with no consequence. If you have mild to moderate mitral valve prolapse, without leakage of blood, you will not need treatment. If you do have moderate leakage, the resultant congestion can be lowered with diuretic medication. If the prolapse has caused arrhythmias, your doctor can treat them. If you have symptoms, your doctor may treat them with drugs.