It is a common misconception that losing weight necessarily means a good thing. Whereas, the truth could not have been farther from it. Losing weight by having a balanced diet and exercising is healthy but many people have a weight loss disorder. Weight loss disorder occurs due to loss of body fat, muscle mass, or fluid intake. It can be a result of medications taken. Infections, hyperthyroidism, arthritis, depression, dental issues, tuberculosis, cancer treatments, and diabetes can cause severe weight loss. Symptoms of weight loss include lack of appetite, dizziness, weakness, and fatigue. If you have lost more than 5 percent of your weight in a period of six months to a year then it is classified as unhealthy weight loss. It is important to contact a doctor if you observe an unhealthy weight loss. That is the weight which you have lost without making healthy changes in your diet and lifestyle. It can be a symptom of some serious illness and can have a major impact on your health. Stress is another factor that greatly affects your weight. It depends on person to person. You can gain an unhealthy amount of weight because of stress and even lose an unhealthy amount of weight due to stress.