Common side effects include abdominal pain, gastrointestinal bleeding, nausea, dizziness, headache, and swelling. Some viral infections also involve fever, fatigue, headache and muscle pain. A headache, and nausea or vomiting may also occur. Dizziness, headache and itching have been reported. Common side effects include vomiting, diarrhea, muscle pain, headache, and rash. Symptoms include fever, weakness and headache. Withdrawal from nicotine can cause irritability, fatigue, insomnia, headache, and difficulty concentrating. Other symptoms include red skin, headache, and dizziness. Other early symptoms may include fever, headache and tiredness. Common side effects include sleepiness, dry mouth, headache, and abdominal pain. Migraines typically present with self-limited, recurrent severe headache associated with autonomic symptoms. Commonly these include loss of appetite, nausea, headache, and rash. Early symptoms may include fever, headache, and feeling tired. Other features may include sweating, dizziness, difficulty in breathing, headache, and confusion. Accompanying symptoms may include a headache and vomiting.