Profile stars indicate how much health information you've shared. The more you share, the more you can understand about your own experience and the more you are helping others to learn.
All 3 star members are eligible for a free PatientsLikeMe t-shirt. Check out your Get 3 stars! page to find out how to get your 3 stars. Once you have 3 stars, you can request your free t-shirt on your stars page.
For example, in the screenshot below, everything that still needs to be updated that is not considered 'up to date' has a blank/white star on the category. You can scroll down the page to see the corresponding categories. To get the star in a category, all the updates listed in that category must have a green checkmark next to them.
When everything is up to date and the corresponding green checkmark shows on the upper left, you should see another button on the right side of the page to get your free t-shirt.