We were interested in examining the relationship between psychosocial factors and hypertension-related behaviors. We hypothesized that lower emotional well-being and unmarried status would be related to higher BP, poorer medication adherence, greater difficulty adhering to diet and exercise, and current smoking. In a cross-sectional design, 636 hypertensive patients completed the Mental Component Summary (MCS) Scale of the SF-12 and rated their difficulty with adherence to diet, exercise, and medication-taking. In logistic regression analyses, lower MCS scores were associated with difficulty adhering to diet (OR = 0.97, p < .05) and exercise (OR = 0.97, p < .01), and current smoking status (OR = 0.98, p < .05). Being married was associated with higher probability of medication adherence (OR = 1.66, p < .01) and a lower probability of being a current smoker (OR = 0.34, p < .0001). Neither MCS scores nor being married were related to BP levels in adjusted analyses. Results emphasize the importance of assessing psychosocial factors to optimize hypertension treatment.