Muscle injuries and dehydration can also trigger cramps. Dehydration is the excessive loss of fluids in the body. Low levels of any of the following minerals that contribute to healthy muscle function may also cause muscle cramps: calcium.
The heart is a part of the cardiovascular system in fact its the main part so if you have heart disease another way of saying this is you have cardiovascular disease.
C5: The deltoid (the shoulder muscle that lifts the arm from the body) is innervated by nerves coming from C5. In addition to shoulder weakness, this radiculopathy may lead to numbness in the shoulder and upper arm. C6: A C6 radiculopathy can lead to weakness in the biceps and wrist extensors.