Twisting the knee is a common cause of overstretched or torn ligaments of the knee. The knee may give out suddenly when the ACL is torn and there may be a popping sound upon injury. Symptoms of a torn ACL include knee pain, swelling, stiffness, and bruising.
Early symptoms of carbon monoxide poisoning such as headaches, nausea, and fatigue, are often mistaken for the flu because the deadly gas goes undetected in a home. Prolonged exposure can lead to brain damage and even death.
Symptoms of Carbon Monoxide Poisoning. Familiarize yourself with the symptoms of carbon monoxide poisoning. A person with flu-like symptoms that are not accompanied by a fever or aches, and appear less severe at certain times of day or in certain areas of the house should be checked out by a doctor.