Why Am I Constipated All the Time? The Hidden Causes of Slow Gut Motility

Bay Functional Health | Tauranga Naturopaths Lisa & Paige

Constipation is one of the most common and misunderstood digestive complaints we see.

People often say:
“I eat fibre and drink water but I’m still blocked.”
“I feel bloated and heavy all the time.”
“I go every few days, but it never feels complete.”
“I alternate between constipation and diarrhoea.”
“My gut just feels sluggish.”
“I’ve had this for years.”

Common questions people search:
“Why am I constipated all the time?”
“Is constipation linked to stress or anxiety?”
“Can hormones cause constipation?”
“Is my thyroid causing slow bowels?”
“Why am I constipated even though I eat well?”
“Can SIBO cause constipation?”

Constipation is rarely just about fibre.
It is usually a gut–brain–hormone–nervous system motility problem.

Your bowel is a muscle tube controlled by:
• The enteric nervous system
• The vagus nerve
• Hormones
• Electrolytes and minerals
• Thyroid signalling
• Gut bacteria and fermentation gases
• Hydration and bile flow
• Emotional and trauma load

When any of these are out of rhythm, motility slows.

The Nervous System & Stress

The gut cannot move well when the body is in fight-or-flight.
Chronic stress, anxiety, trauma, burnout and post-viral states reduce vagal tone and suppress peristalsis.

This is why constipation often worsens with:
• Busy lifestyles
• Emotional holding
• Anxiety
• Long COVID
• Burnout
• Children and teens under academic or social stress

A regulated nervous system is one of the most powerful motility tools.

The Gut–Brain Axis

Serotonin drives gut movement.
Around 90% is made in the gut.

Dysbiosis, inflammation and low-grade infection alter serotonin signalling and slow transit, contributing to:
• Constipation
• IBS-C
• Alternating bowels
• Bloating and gas
• Incomplete evacuation

SIBO & Methane

Methane-producing bacteria actively slow the bowel.
This is a major cause of stubborn constipation and bloating, often resistant to fibre and laxatives.

Hormones & Perimenopause

Progesterone slows smooth muscle.
High progesterone phases (luteal phase, pregnancy) and fluctuating hormones in perimenopause can reduce motility.

Oestrogen affects bile flow and microbiome composition, influencing stool consistency and transit time.

Thyroid & Metabolism

Low or borderline thyroid function is a classic driver of slow bowels.
Even “normal” labs can mask tissue-level sluggishness, leading to:
• Constipation
• Bloating
• Fatigue
• Cold intolerance
• Weight gain

Bile Flow & Liver-Gallbladder Axis

Bile is a natural bowel stimulant.
Poor bile flow after gallbladder issues, hormonal shifts, or liver overload can cause pale, dry stools and sluggish transit.

Electrolytes & Hydration

Magnesium, potassium and sodium are essential for muscle contraction and nerve signalling.
Low magnesium is one of the most common causes of hard stools and slow motility.

Nutrients for Motility

• Magnesium – smooth muscle relaxation and peristalsis
• Thiamine (B1) – enteric nerve signalling
• B12 – nerve conduction
• Iron – deficiency can alter motility and fatigue the gut
• Zinc – gut lining and microbiome balance
• Protein – neurotransmitter and muscle support

Trauma & Holding Patterns

The pelvic floor and colon often hold emotional tension.
Chronic “holding on”, hypervigilance and early life stress can manifest as lifelong constipation patterns.

Why Fibre Alone Often Fails

Fibre adds bulk, but it does not fix:
• Nerve signalling
• Vagal tone
• Thyroid drive
• Methane overgrowth
• Hormonal slowing
• Dehydration at cellular level
• Pelvic floor dysfunction

At Bay Functional Health, constipation is approached as a motility and regulation issue, not just a stool problem.

Paige specialises in:
• Constipation and slow transit
• SIBO and methane overgrowth
• Gut–brain axis and serotonin signalling
• Microbiome repair
• Pelvic and enteric nervous system support

Lisa supports:
• Stress, burnout and nervous system regulation
• Hormonal transitions and perimenopause
• Thyroid and metabolic patterns
• Post-viral autonomic dysfunction
• Sleep and circadian rhythm

When motility is restored at the nervous system, hormonal, microbial and metabolic level, the bowel remembers how to move again.

Lisa & Paige