Goosebumps

By Wayne Persky

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Goosebumps (piloerection) occur when tiny smooth muscles (arrector pili) attached to hair follicles contract. This is controlled by the sympathetic nervous system (fight-or-flight), triggered by:

• Cold exposure
• Emotional stimuli (fear, awe, music)
• Sudden autonomic activation

In humans, it’s a vestigial reflex left over from fur-bearing ancestors.

​How aging affects goosebumps:

1. Reduced hair follicle density:

With age, hair follicles miniaturize or disappear, and fewer follicles means fewer visible goosebumps. This is the most obvious reason older adults notice them less.

2. Decline in arrector pili muscle function:

Smooth muscle responsiveness decreases with age. Muscles may still contract, but less forcefully. The result is weaker or patchy goosebumps.

3. Autonomic nervous system changes:

Aging alters sympathetic signaling, due to lower nerve conduction, reduced neurotransmitter release, and less dramatic reflex responses. This affects not only goosebumps, but also:

• Thermoregulation
• Blood pressure responses
• Sweating patterns

4. Skin structural changes

Thinner dermis, reduced collagen and elastin, and loss of subcutaneous fat, alter the ability of skin to respond to stimulation, so that even if piloerection occurs, the skin may not “pucker” visibly.

When goosebumps persist or increase with age:

Interestingly, frequent or exaggerated goosebumps in older adults can signal increased autonomic sensitivity, often associated with:

• Chronic inflammation
• Mast cell activation
• Neuropathic sensitization
• Hormonal shifts (estrogen/testosterone changes)

So what does this have to do with microscopic colitis (MC)?

This is sometimes seen in people with:

• Chronic inflammatory or autoimmune conditions
• Neuropathic pain syndromes
• Dysautonomia

​So more goosebumps isn’t always “better reflexes” — it can reflect heightened neuroimmune signaling.

The bottom line is:

Normal aging tends to be associated with fewer, weaker goosebumps, due to changes in hair follicles, skin, muscle, and autonomic nerves.​

Persistent or exaggerated goosebumps later in life may indicate increased autonomic or inflammatory activity rather than youthfulness.