You are soaking through more than one tampon or sanitary pad in an hour, for several hours at a time.
You need to double-up on sanitary pads or need both a tampon and a pad.
You wake up during the night because you need to change protection.
You notice large blood clots in your flow.
Your period lasts more than a week.
You can’t participate in your normal activities because your flow is too heavy.
You have signs of anemia, which include fatigue, pale skin, shortness of breath and dizziness.