Premenstrual syndrome (PMS) is a common psychological condition that occurs continuously during the luteal phase of the menstrual cycle. Potential factors in this syndrome comprise the central nervous system, hormones, genetic background, and nutritional indicators. Little is known about foods or eating patterns that may be associated with this syndrome, yet nutritional factors can be considered in strategies for the management of PMS. The current study purposed to investigate the relationship between PMS and dietary inflammation index as well as PMS and food patterns. The present cross‐sectional study was conducted on 125 women and girls aged 20–46 years who experienced symptoms of PMS. The inclusion criteria included cooperation and consent to enter the study, a body mass index of 18.5–25 kg/m2, no underlying disease, no use of contraceptives or antidepressants, and no use of multivitamin or mineral supplements. In the first stage of this study, participants' height, weight, waist circumference, and hip circumference were measured. In the second stage, eating habits were examined using a semiquantitative Food Frequency Questionnaire. This study found a significant correlation between glycemic load quintiles as well as between energy and macronutrient intake and the dietary inflammatory index; however, it revealed a direct correlation between PMS and both Western‐mixed dietary and high‐salt–high‐sugar dietary patterns. Moreover, the Western food pattern was found to have a direct correlation with dietary inflammatory index, and the healthy food pattern had an inverse correlation with this index. This study showed that PMS symptoms are more severe with the consumption of high‐salt–high‐sugar or a Western‐mixed food dietary pattern. It seems that an imbalance in hormones and neurotransmitters can affect the metabolism of proteins, carbohydrates, and fats. Also, some foods, such as vegetables, and low‐fat and high‐fiber diets reduce plasma estrogen levels and the duration of PMS symptoms.