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For most people, pain is an automatic reflex that protects them from damaging stimulus like a hot stove or candle. For example, heat exposure activates pain receptors in the skin, which pass a signal along a sensory neuron to the spinal cord. This activates a motor neuron, which sends a signal to the muscles in the arm, causing it to contract. But nerve damage can send false signals that cause real pain, or prevent individuals from feeling pain when they are injured.

Nerve damage affects approximately 20 million Americans. There more than 100 different types of nerve damage with a range of different causes including compression, trauma, autoimmune diseases, diabetes, motor neuron diseases, nutritional deficiencies, infections, cancer and drug side effects and toxicities. Learn more about the symptoms of and treatments for neuropathic pain with this slideshow.

Babies that fail to respond to their name by the age of 12 months or that are consistently unresponsive to the voice of a parent may be displaying early signs of an ASD.

Autism Spectrum Disorders (ASDs) are a group of developmental disorders that pose social, behavioral and communication challenges that range from mild to severe. The CDC estimates that one in every 110 U.S. children have an ASD and approximately 730,000 people aged 0 to 21 years currently live with the disorder. On average, boys are four-…