This invention relates to a system for self treatment. The system consists of several portable modules where one of the modules is designated as a master module. The master module controls, supervises and monitors all the mutual information and data exchange between itself and the rest of the modules. The modules can e.g. consist of a BGM, a doser, an inhaler, a tablet dispenser and a storage container. The modules may be able to generate and store data which is transmitted to the master module if it is within range and active. If the master module is not within range, the data is kept locally in the module until the master module is available or a new master module is designated. The master module or another specific module can send the data to an external unit like a computer or database for further processing. A physician or an expert care-team can access the data in the database and give guidance to the patient on the basis of these processed data. This processing could also be done automatically by utilization of an expert system.