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The research applied a semi-experimental method using pre-test and post-test with control group. The statistical community is made up of all hypertension stricken patients, extracted from Babol based Shahid Beheshti Hospital during three months from August to October 2015 among the mentioned hospital files. Out of this, 32 patients have been selected via nonrandom sampling method and randomly included in the experimental and control groups; The experimental group has been provided with eight 2.5 h sessions of mindfulness-based cognitive therapy (MBCT). The data have been collected through Intolerance of Uncertainty Scale (IUS). To compare the two experimental and control groups' mean scores, the effect of pre-and post-tests scores and other interventive variables on post-test sores has been applied. The covariance test results indicated that pre-test didn't exert remarkable effect on post-test derived results and also MBCT led to the experimental group's IU decrease. The findings imply that applying MBCT has directly affected the hypertension sufferers' IU drop [ABSTRACT FROM AUTHOR]