Signs and symptoms of autonomic neuropathy depend on which nerves are damaged. They might include: 
Dizziness and fainting when standing, caused by a sudden drop in blood pressure.
Urinary problems, such as difficulty starting urination, loss of bladder control, difficulty sensing a full bladder and inability to completely empty the bladder. Not being able to completely empty the bladder can lead to urinary tract infections.
Sexual difficulties, including problems achieving or maintaining an erection (erectile dysfunction) or ejaculation problems. In women, problems include vaginal dryness, low libido and difficulty reaching orgasm.
Difficulty digesting food, such as feeling full after a few bites of food, loss of appetite, diarrhea, constipation, abdominal bloating, nausea, vomiting, difficulty swallowing and heartburn. These problems are all due to changes in digestive function.
Inability to recognize low blood sugar (hypoglycemia), because the warning signals, such as getting shaky, aren't there.
Sweating problems, such as sweating too much or too little. These problems affect the ability to regulate body temperature.
Sluggish pupil reaction, making it difficult to adjust from light to dark and seeing well when driving at night.
Exercise intolerance, which can occur if your heart rate stays the same instead of adjusting to your activity level.
