(e.g., tachycardia , labile blood pressure, hyperthermia ), neuromuscular aberrations (e.g., hyperreflexia , incoordination ) and/or gastrointestinal symptoms (e.g., nausea , vomiting , diarrhea ). Withdrawal symptoms may occur if tramadol is discontinued abruptly. These symptoms may include: anxiety , sweating , insomnia, rigors , pain , nausea , tremors , diarrhea