Signs and symptoms that could indicate a serious health condition, and you should see a doctor if you experience any symptoms of concern.
• Symptoms of lung problems include coughing up blood, shortness of breath, difficulty breathing, chronic cough, repeated bouts of bronchitis or pneumonia, and wheezing.
• Symptoms of stomach or digestive problems include rectal bleeding, blood in the stool or black stools, changes in bowel habits or not being able to control bowels, constipation, diarrhea, heartburn or acid reflux, or vomiting blood.
• Symptoms of bladder problems include difficult or painful urination, frequent urination, loss of bladder control, blood in urine, waking frequently at night to urinate or wetting the bed at night, or leaking urine.
• Symptoms of emotional problems include anxiety, depression fatigue, feeling tense, flashbacks and nightmares, disinterest in regular activities, suicidal thoughts, hallucinations, or delusions.
• Symptoms of headache problems (not including everyday tension headaches) include headaches that come on suddenly, "the worst headache of your life," and headache associated with severe dizziness, nausea, vomiting, and inability to walk.
Courtesy: Medicine Net