Chronic tension-type headaches (CTTHs) affect 30-40% of the population and account for a number of absences from, and decreased performances at, work and school as well as recreational activities. CTTHs typically occur at least 15 times a month or at least every second day, and present as an achy or tight sensation that is felt around the head . The pain may last from 30 minutes to several days and varies in intensity . Conventional treatment is palliative, consisting of analgesics and non-steroidal anti-inflammatory drugs (NSAIDs), which may produce adverse effects and analgesic rebound headaches . Lacticum acidum 30CH is a homoeopathic remedy that has been shown to have potential benefits in the treatment of CTTHs . Homaccords are the preparation of one remedy in multiple increasing potencies in a single vehicle . There has been no research done to date on Lacticum acidum Homaccord in the treatment of CTTHs.The aim of this study is to determine the efficacy of Lacticum acidum Homaccord in the treatment of chronic tension-type headaches, using the modified Headache Diary and the Headache Disability Inventory.