Nerve messages also help regulate your body activities such as breathing, heartbeat, digestion, excretion, and your blood pressure and immune system so that you can respond to germs, changes in temperature and all kinds of stress. In addition to nerve impulses, nutrients flow over your nerves to nourish your muscles and tissues. If this flow is blocked it may cause your muscles to waste away. If your nerves are "pinched," "impinged" or otherwise interfered with, the flow of messages and nutrients over them can be disrupted and your body can become "dis-eased" or weakened. When you are dis-eased you have less energy and vitality and are less able to deal with physical and emotional stress. Lowered resistance to disease, infection, colds, flu, allergies, ulcers, constipation, diarrhea, asthma, fevers, headaches, seizures, bed-wetting, hearing, balance or visual disturbances and many other health problems have been related to an unhealthy nervous system.