Previous research suggests that the mental and physical health of the Type B personality should be better than that of the Type A personality. To test this hypothesis, 81 university students responded to the Glass (1977) version of the Jenkins Activity Survey for college students which assessed perceived health status. The results showed that 54 percent of the Type A's perceived themselves to be in excellent health compared to 36 percent of the Type B's. In general, the Type A students perceived themselves to be in better health than did Type B students. While these data are at odds with the relative incidence of diseases in Type A's and B's, they may be consistent with certain patterns of behaviors which distinguish Type A's from Type B's. A treadmill study described by Balke, Grillo, Konecci, and Ruft (1954) reported that even though Type A and Type B subjects were matched for physical characteristics, Type A's worked closer to their level of endurance and expressed less fatigue than the Type B's. These two studies, taken together, suggest that the awareness of fatigue or physical illness is so threatening to Type A's that they cannot consciously acknowledge it. Further exploration is needed of possible differences in how Type A's and B's cognitively cope with various stressful situations and how these differences may affect their behavior and susceptibility to stress related diseases later in life. (KGB)