Why Am I So Tired All the Time? Understanding Teen Fatigue
If you’re a teen constantly feeling exhausted—even after a full night’s sleep—you’re not alone. And if you’re a parent wondering why your once-energetic kid suddenly needs three naps a day? That’s valid, too.
Fatigue is one of the most common complaints in adolescence, and it’s not just because of school or screen time. There’s usually something going on under the surface—especially for girls and people assigned female at birth.
Let’s break it down.
Common Causes of Fatigue in Teens
1. Mental Load & Stress
Between school, social pressure, college apps, social media, and just trying to figure out life—teen brains work overtime. Mental exhaustion is real, and it shows up in the body as straight-up tiredness.
2. Poor Sleep Quality
Most teens need 8–10 hours of sleep a night. But thanks to late-night scrolling, anxiety, and changing melatonin rhythms during puberty, most aren’t getting it. And even when teens do sleep, it might not feel restful.
3. Low Iron (Common in Teen Girls)
Periods = blood loss = iron loss. If teen girls feel weak, foggy, or lightheaded—especially around their cycle—it could be iron deficiency. This is very common and easily treatable once diagnosed.
4. Hormonal Imbalance
Conditions like PCOS, thyroid issues, or PMDD can mess with a person’s energy. These are often missed or brushed off.
5. Nutrition & Blood Sugar Swings
Skipping meals, overdoing sugar, or under-eating protein can all lead to energy crashes. Teens’ bodies need real fuel, especially when they’re growing fast and dealing with hormone changes.
So… Is This Normal?
Some tiredness is normal during puberty. But if any of this sounds familiar, it’s worth checking in with a provider:
Getting enough sleep but still feel drained
Too tired to do things you normally enjoy
Feeling dizzy, foggy, or weak
Heavy periods that result in feeling wiped out
Intense mood swings and tied to exhaustion
Fatigue isn’t just “teen drama.” It’s the body asking for help.
What You Can Do
Try keeping a sleep + energy log for a week
Make sure to eat real meals (especially breakfast)
Talk to a provider about checking iron, thyroid, or hormone levels
Rule out any underlying conditions like PCOS or PMDD
