Rapid weight loss. If a person loses weight without any changes in his way of life that could affect his body weight, or if the foods in your daily diet seem unattractive to you – it is important to find out a background, because lung cancer signs in the early stages can include deprivation of appetite and inexplicable weight loss. What a person experiences: some people have the reluctance to take food and forget to eat; they may also notice that their clothes are getting too big, although they do not eat less. If the bad appetite continues to persist, or you keep on to lose weight without any effort on your part, consult a doctor.