Including hashtags in your birthday captions can help increase the visibility of your post and reach a wider audience. Consider using popular birthday-related hashtags like #HappyBirthday, #BirthdayCelebration, or #BirthdayLove. Additionally, you can include hashtags that are relevant to the person or the theme of the birthday celebration. However, don’t go overboard with hashtags, as it can make the caption look cluttered. A few well-chosen hashtags will suffice.