Many people who suffer from chronic illnesses also suffer from depression. Depression isn't something that should be overlooked; it should be brought to your doctor's attention so that it can be treated. But how do you spot depression? With help from prevention.com, we've put together a list of some of the most common physical signs that someone is suffering from depression. Aches and Pains Although many chronic illnesses have their share of aches and pains, depression can also make muscles and joints feel sore or exacerbate the problem. People who are happy or content generally feel pain less than those who have depression. Difficulty Sleeping or Waking Through the Night Not being able to relax enough to fall asleep or frequently waking up during the night and finding it difficult to go back to sleep could both be signs of depression. Lack of sleep or disturbed sleep can have a profound effect on mood and the ability to concentrate. Changes in Weight Loss of appetite or comfort eating are both associated with depression, but you may not realize you have either until you step on the scale and notice a difference. In addition, if you're not sleeping well because you're anxious or depressed, this can also mess with your appetite leading to weight loss or gain. RELATED: Eight fibromyalgia facts you’re probably unaware of. Skin Complaints Because depression affects hormones, this often becomes apparent in our skin. Depression can lead to skin complaints like acne, psoriasis, and eczema and treating the depression can help with the skin complaint.