Anemia
Anemia was a blood disorder.

In 2268, Doctor Leonard McCoy commented that Hanar was a bit anemic, and blamed it on his consumption of food in pills rather than solid food. He gave the Kelvan a shot of what he deemed a "high-potency vitamin concentrate" and recommended he have three like it a day for the next few days. In reality, it was part of a ruse intended to distract Hanar and the rest of the Kelvans in order to seize the devices which had turned crew members of the  into solid blocks. ()

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Medical conditions