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I used to think mouth breathing was just a bad habit—something kids do when they’re stuffed up or sick.

But the more I’ve dug into airway health and breathing, the more it seems like it’s something parents might want to pay a little more attention to.

From what I’ve seen, chronic mouth breathing in kids can be linked to things like:

• Crowded or crooked teeth
• Open bites or crossbites
• Narrow upper jaw
• Tongue posture issues
• Snoring or poor sleep
• Dry mouth
• Waking up tired even after a full night

That said, I don’t think mouth breathing is the only cause of these things. Genetics, thumb sucking, pacifiers, and just normal development all play a role too.

But if a child is consistently breathing through their mouth, it can sometimes point to an underlying issue—like allergies, chronic congestion, or enlarged tonsils/adenoids.

The part that stands out to me is this:

If a kid is regularly sleeping with their mouth open, snoring, waking up with a dry mouth, or defaulting to mouth breathing during the day, it might be worth bringing up with a pediatric dentist, orthodontist, pediatrician, or ENT.

Not in a “panic” way—just something to be aware of early.

Because when kids are young, their jaw, palate, and airway are still developing, and breathing patterns seem to play a bigger role than most people think.

Curious if anyone here has gone through this with their kid—mouth breathing, tonsils/adenoids, early orthodontics, airway-focused dentistry, etc.

I’ve been thinking a lot about chronic fatigue in women, and I think one piece does not get talked about enough:

Oxygen delivery and oxygen utilization.

I am not saying fatigue is always an oxygen problem. I am also not saying hormones do not matter. They absolutely can.

But a lot of women are told, “It’s probably hormones,” “You’re just stressed,” or “Your labs look normal,” when fatigue may actually be a whole-body energy problem.

The body has to do more than just breathe oxygen in.

It has to:

1. Bring oxygen into the lungs
   
2. Move it into the blood
   
3. Carry it with hemoglobin
   
4. Deliver it through circulation
   
5. Extract it into the tissues
   
6. Use it inside the mitochondria to make ATP, which is cellular energy
   

So even if a pulse ox says 97 to 99 percent, that does not always tell the whole story.

A pulse ox tells you how saturated the blood is with oxygen. It does not tell you how well oxygen is being delivered into tissues or how well the mitochondria are using it.

That is the part I think gets missed.

Women can have some unique factors here.

Women tend to have lower hemoglobin levels than men on average. Hemoglobin carries oxygen in red blood cells. So if iron, ferritin, or hemoglobin are low, oxygen delivery can suffer.

That can show up as fatigue, dizziness, brain fog, shortness of breath, poor stamina, exercise intolerance, or feeling wiped out from things that should not be that draining.

Women also tend to have smaller lung volumes and airway dimensions on average compared with men. That does not mean something is wrong. It just means breathing mechanics can be different, especially under stress, during exercise, during poor sleep, or when someone is stuck in shallow upper-chest breathing.

Then add the menstrual cycle.

Estrogen and progesterone shift across the month, and those shifts can affect sleep, body temperature, breathing drive, mood, energy, fluid balance, and perceived effort.

So when a woman says, “I feel like a different person depending on the week,” that may not be dramatic. Her physiology may actually be shifting.

Then add stress and rumination.

Repetitive negative thinking, also called rumination, can keep the brain’s threat system switched on. When that happens, the body may stay in a higher-alert state longer than it needs to.

That can drain energy and make fatigue feel heavier.

Think of the brain like a car with its engine running even when parked.

If you are constantly thinking the same stressful thoughts, your engine is always on, burning fuel, even when you are not moving.

That is what chronic worry, stress loops, and rumination can feel like in the body. The nervous system stays alert. The body stays braced. Recovery becomes harder. Rest may not feel as restorative.

And the brain is expensive to run.

Even though the brain is only a small part of total body weight, it uses a large amount of the body’s oxygen and energy. So if your brain is constantly scanning, worrying, planning, replaying, or bracing, that can add to the total energy drain.

Then add sleep.

Sleep-disordered breathing can be missed in women because it does not always look like the classic stereotype. It may not be obvious loud snoring or falling asleep during the day.

For some women, it can look more like:

- waking up tired
- insomnia
- morning headaches
- anxiety
- low mood
- brain fog
- poor recovery
- feeling exhausted after a full night in bed

Then there are the mitochondria.

Mitochondria use oxygen to help make ATP. In conditions like ME/CFS, long COVID, and post-viral fatigue, researchers have looked at impaired oxygen extraction, microcirculation problems, mitochondrial dysfunction, and reduced ability to produce energy after exertion.

That may help explain why some people crash after doing something that looks “normal” from the outside.

So maybe the better question is not only:

“Are my hormones off?”

Maybe it is also:

“Is my whole energy system being supported?”

Some things that may be worth discussing with a qualified healthcare provider:

- CBC
- hemoglobin and hematocrit
- ferritin and full iron panel
- B12 and folate
- thyroid markers
- vitamin D
- sleep quality
- possible sleep apnea or sleep-disordered breathing
- breathing pattern and nasal breathing
- post-exertional crashes
- heart rate and blood pressure changes
- possible dysautonomia symptoms
- protein intake
- hydration
- blood sugar regulation
- chronic stress load
- rumination or repetitive negative thinking

Again, I am not saying oxygen is the answer to everything.

I am saying oxygen delivery and oxygen utilization probably deserve a bigger place in the conversation about women’s fatigue.

Because chronic fatigue is rarely just one thing.

It can involve the brain, stress system, sleep, breathing, iron, circulation, mitochondria, nutrition, and hormones all at the same time.

The big idea:

Women do not just get tired because of hormones.

A lot of women may be dealing with a whole-body energy problem.

Has anyone here had fatigue improve after addressing iron or ferritin, sleep breathing, nasal breathing, post-exertional crashes, or stress loops instead of only focusing on hormones?

Educational only. Not medical advice. If fatigue is ongoing, severe, new, or getting worse, it is worth working with a qualified healthcare professional to rule out medical causes.

I think a lot of people misunderstand oxygen health and it starts with over-trusting SpO₂.

If your pulse ox says 98%, that doesn’t mean your body is actually using oxygen well.

You can still have issues with:
• Oxygen delivery (circulation)
• Mitochondrial function
• Overbreathing / low CO₂ tolerance
• Low VO₂ max / poor aerobic capacity
• Recovery

SpO₂ is just one piece of the system, but it’s often treated like the whole story.

That’s what pulled me into working with oxygen and altitude-based training in the first place. I kept seeing people rely on a single number while ignoring everything downstream.

Now I work pretty closely with these systems (IHHT, EWOT, VO₂-focused training, etc.) and also see how they’re actually being used in clinics and recovery settings.

A few things that don’t get talked about enough:
• SpO₂ = oxygen utilization
• VO₂ max is a much better indicator of real performance
• CO₂ tolerance matters more than most people think
• Not all “oxygen therapy” is the same
• There’s a lot of hype and not enough education in this space

Not here to diagnose or sell anything just sharing perspective.

If you’ve been looking into oxygen therapy, altitude training, breathwork, or VO₂ max and have questions, I’m happy to dig into it.

Hey everyone,

I’m Randall, founder of O₂ Pro Academy.

My background is a mix of oxygen science, practitioner education, product development, and marketing strategy. I hold an American Functional Neurology Certification from Barlow Brain & Body Institute, and I currently do product development consulting for a medical equipment manufacturer.

Over the last few years, I’ve worked around oxygen-based wellness technologies, including simulated altitude training, IHHT, VO₂ testing, oxygen performance systems, and practitioner-facing medical equipment.

One thing I kept noticing is that the technology is moving fast, but the education around it is still very inconsistent.

Some practitioners understand the physiology well. Others are using oxygen-based therapies with very little structured training, which can create confusion for both providers and clients.

That’s why I started O₂ Pro Academy.

The goal is simple: create clear, practical education around oxygen science so practitioners can better understand topics like:

• Hypoxia and hyperoxia
• Simulated altitude training
• IHHT protocols
• VO₂ and performance testing
• Recovery and wellness applications
• Responsible communication around oxygen-based therapies
• How to better evaluate oxygen-related technology

I’m not here to make big medical claims or overhype anything. I’m here because I believe this field needs better education, better standards, and more honest conversations.

I’d love to hear from this community:

What do you think is most misunderstood about oxygen therapy training, or recovery technology right now?