Your doctor might also want to perform an electromyography EMG , a test that evaluates muscle or nerve problems. Decline in self-care may also indicate the older adult is experiencing pain. Translation of grimace Nglish: Behavioral neurology Clinical neurophysiology Neurocardiology Neuroepidemiology Neurogastroenterology Neuroimmunology Neurointensive care Neurology Neurooncology Neuro-ophthalmology Neuropathology Neuropharmacology Neuroprosthetics Neuropsychiatry Neuroradiology Neurorehabilitation Neurosurgery Neurotology Neurovirology Nutritional neuroscience Psychiatry. In particular, there are no known nociceptors in groups such as plants, fungi, and most insects,  except for instance in fruit flies. See what questions a doctor would ask. The Cochrane Database of Systematic Reviews.