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.
There are a number of symptoms that are indicators of possible carbon monoxide poisoning. These symptoms vary depending on the amount of exposure to the actual poison. Recently, studies have been performed to show that chronic carbon monoxide poisoning can result in long term, residual effects on our bodies. Dr. David G. Penney has conducted one such study. He suggests that long periods of exposure to carbon monoxide, even at low levels, can result in long-term effects.