You’re experiencing headaches
One of the most common symptoms following a head injury such as a concussion, headaches occur in about 30 percent of people reported, and are usually the result of blood or fluid collecting in small deposits inside the skull. The majority of headaches following a brain injury aren’t usually something to get too worried about, bit if you begin experiencing additional concussion symptoms in the first few days following the incident, such as arm or leg weakness, difficulty speaking, sleeplessness, or if a headache continues to get worse, you’ll want to visit a doctor immediately. (Here are more concussion symptoms you should never ignore.)
You can’t seem to smell anything
One possible symptom of a head injury is called anosmia, otherwise known as a loss of smell. This one may be harder to notice for most, even doctors, as many simply tend not to bother asking or testing for a loss of or change in one’s ability to sniff out an odor, but a good sign to keep in mind nevertheless. This surprisingly common symptom is likely caused by damage made to the nasal passageways, and because a loss of smell isn’t exclusive to a head injury (this can also be a sign of Alzheimer’s) it’s important to visit your doctor to identify the cause.