Nausea in male teens can have many causes, and some produce moderate symptoms while others have severe symptoms. Any adverse physical condition that cannot be readily explained, or that persists beyond 24 hours, should be seen by your family doctor. If it is acute or accompanied by pain, you might want to take your son to an emergency medical facility immediately. If the problem is chronic, keep a record of occurrences.
According to WebMD, nausea is not a disease. It is a symptom that occurs in response to a circumstance or to a physical condition. The sensations that are described as nausea are either a desire to spit up the contents of your stomach, or actually vomiting. Teens can catch a bug that is going around in their school, which might cause vomiting. Nausea might also be a response to stress. Hormonal changes, changes in eating habits or emotional stress could all be factors in teen male nausea.
Nausea that leads to vomiting can be your son's body trying to rid itself of something he consumed. Causes could include alcohol consumption or a short-term illness being passed around at school. He might even be dreading an exam or an important tryout for sports or other school competition. Ask your son what he ate last. Check with his friends, other parents and with the school to see if any other teens have the same symptoms. If the nausea is accompanied by pain or seems severe, seek medical help right away.
Nonemergency Longer-term Causes
Food allergies and stress can cause nausea. If symptoms are persistent, yet your family physician isn't finding any obvious causes for your son's distress, you might start keeping a journal that records when the symptoms occur most often. Include in the journal foods that were eaten, stress-producing circumstances such as drama or musical performances or playing in a big sports game. Make note of weather conditions because some teens are more sensitive to heat or high pollen counts than others. Armed with more information, your doctor might have a better chance of diagnosing the problem.
Some Possible Severe Conditions
Appendicitis can cause nausea. It is usually accompanied by severe pain in the lower abdomen, either constipation or diarrhea, gas and fever. WebMD describes it as a medical emergency, and states that surgery is required. A less severe, but still painful, cause is kidney stones. According to MayoClinic.com, kidney stones are caused by calcium deposits that form hard lumps in the urinary tract. Symptoms include nausea, vomiting, and painful or blocked urination. Your doctor will know whether emergency treatment is needed or whether your son can have some medication and lots of water while waiting for the stone to pass. MayoClinic.com also lists "persistent indigestion or discomfort after eating," as a possible symptom of cancer.