It deals with lack of proper functioning of the nerves that control involuntary muscles.The nerves affected are the ones which control blood pressure, heart rate, temperature and digestion. These are vital metabolic processes and makes this complication a serious one which is why it gives rise to lots of symptoms.
They include :
Anhidrosis(inability to sweat)on the hands and feet
Let's say you enjoy swimming. One day you decide to swim alone. But it's a risky idea because you could drown and no one would be there to help you in time. So it's best to have others around incase you have an accident or need help.