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.
Carbon monoxide poisoning can cause brain damage and death. You can't see it, smell it, or taste it; but carbon monoxide can kill you. 1  Carbon monoxide is odorless, tasteless, and colorless gas is known as the silent killer.. 2  Carbon monoxide is produced by common household appliances.