Caffeine On Periods Is Not Such A Good Idea. Here's WhyCaffeine On Periods Is Not Such A Good Idea. Here's WhyImage Credits: Canva Caffeine can worsen cramps when you have periods. Image Credits: Canva Caffeine can disrupt your sleep which will leave you feeling tired and low on energy. Drinking coffee, tea or anything with caffeine can leave you dehydrated. During periods, women may face digestion issues. This gets worse if you have caffeine. Image Credits: Canva Caffeine may trigger mood swings and leave you feeling anxious or jittery. Image Credits: Canva Consuming caffeine during periods can block the body's iron absorption. Caffeine may even wreck havoc on your hormones during periods. Image Credits: Canva Drinking coffee during periods can even give you a headache. The acid present in coffee may also increase bloating during periods.