Concussion
A concussion was a common injury characterized by a loss of humanoid brain function as a result of a trauma. One of the symptoms was ringing in the ears. ()

In 2152, Commander Charles Tucker III suffered a mild concussion when  was damaged during the destruction of Paraagan II, but Doctor Phlox believed that he would be fine. ()

That same year, Ensign Hoshi Sato suffered a severe concussion when  was struck by a Romulan orbital mine. She eventually made a complete recovery, but was eager to return to her post, even before Phlox had finished treating her. ()

In 2153, Captain Jonathan Archer suffered a concussion after being struck by a spatial anomaly but made a complete recovery. () 

In 2267, Chief Engineer Montgomery Scott was thrown against a bulkhead of the , causing a concussion for which he needed rest. ()

In 2367, Jono was found to have a low-grade concussion, sustained at some point while engaging in the Talarians' rough-and-tumble games. ()

Soon after, Doctor Beverly Crusher found no indication of a concussion to explain the loss of Deanna Troi's empathic abilities. ()

In 2368, Soren suffered a concussion when the Magellan suffered an inertial damper failure and she was thrown across the shuttlecraft floor. ()

In 2369, Tahna Los came aboard Deep Space 9 with a minor concussion after his scout ship was destroyed by a Cardassian warship. ()

According to Doctor Julian Bashir, the illusory Jadzia Dax had a "nasty concussion" after she knocked her head on a console. ()

In 2370, Jean-Luc Picard was concerned that Voval might have had a concussion following the crash of the Iyaaran shuttle. ()

Soon after, Bashir found that Melora Pazlar had suffered no concussion following a fall. () 

After shifting into an alternate quantum reality that year, Lieutenant Worf had suffered a concussion after being hit over the head in a Bat'leth competition that he had won in the prime reality. Doctor Crusher recommended vertazine to treat it. ()

In 2371, The Doctor, having just been activated, casually diagnosed an injured  crewman as not having a concussion and for him to be cleaned up to resume duty. ()

Later that year, Tuvok received a concussion following a Komar energy discharge. ()

Also that year, in a malfunctioning holoprogram, The Doctor visually diagnosed a holographic Kathryn Janeway as having a concussion. ()

Soon after, Dax was dealt a severe concussion on the  by a Changeling . ()

In 2372, Captain Benjamin Sisko received a concussion when the Defiant came under attack from a Jem'Hadar warship. ()

Also that year, Keiko O'Brien received a concussion when she was thrown against the bulkhead of the . ()

Soon after, Teirna came aboard Voyager with a concussion among other injuries. ()

In 2373, Arridor and  dealt Ensign  a blow that left him with a severe concussion. ()

Later that year, Neelix received a moderate concussion in a plasma explosion. ()

Soon after, Neelix was diagnosed with a concussion while trying to aid a Nezu planet being bombarded by asteroids. ()

A short while after, Tom Paris suffered a mild concussion when his head struck the side of the  while trapped in an astral eddy. ()

In 2374,  was beamed aboard Voyager with a minor concussion. ()

In 2375, Paris told Samantha Wildman she had a minor concussion following the crash of the , though he was understating the extent of her injuries. ()

In 2376, B'Elanna Torres suffered a mild concussion in a vision she experienced following a near-death experience. ()

Later that year, Chakotay was dealt a severe concussion aboard the Flyer due to shock waves from a dark matter asteroid colliding with a graviton ellipse. ()

In 2378, while playing the role of the EMH in The Doctor's holonovel Photons Be Free, Paris treated Lieutenant Marseilles' concussion. ()

Sometime later that year, Paris was concerned that Joe Carey might have a concussion after being assaulted by the natives on an unidentified planet, but was prevented by  from treating him with equipment from his medkit. ()

In 2381, Paris, while on a handshake tour at the , assaulted Ensign Bradward Boimler after mistaking the disheveled Ensign for a Kazon. After meeting up with his fellow Ensigns in the brig, Boimler mistook a wall with a seam on it for a malfunctioning door. When Ensign D'Vana Tendi pointed it out, Boimler laughed it off and nonchalantly mentioned that he might have a concussion as he left. ()

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Medical conditions