A millipede that is not moving is often just resting, hiding under the substrate, or preparing to moult. Before assuming illness, check the enclosure conditions, recent changes, and whether the body looks normal for the species and situation.

If you want a wider overview of warning signs and next steps, start with our Millipede Troubleshooting Guide.

Is it resting, moulting or unwell?

The first question is not simply whether the millipede is moving, but whether its stillness fits normal behaviour. Many millipedes spend long periods buried or hidden, and newly acquired animals may stay out of sight while they settle in after transport.

Normal stillness is more likely if the millipede looks full-bodied, is in a typical resting posture, and shows no obvious signs of decline. It becomes more concerning if the body looks limp, thin or shrivelled, if there is a strong unpleasant smell, if the colour has changed unusually, or if the animal appears damaged or unable to right itself.

A tightly curled millipede may be defending itself, stressed, or moulting. If that is the main sign you are seeing, see Why Is My Millipede Curled Up and Not Moving?.

If you are unsure whether the animal is simply resting or may be in a hidden moulting period, compare what you see with Is My Millipede Dead or Moulting?.

Where to start

Start with the simplest checks first:

• Has the enclosure dried out too much, or become too wet and poorly ventilated?
• Has the substrate been disturbed, cleaned, compacted, or changed recently?
• Has the millipede been moved, handled, or exposed to bright light or vibration?
• Is there suitable deep, organic substrate with leaf litter and decaying wood available?
• Is this a new arrival that may still be settling in?

Millipedes naturally live under soil, leaf litter and decaying wood, so long periods out of sight are normal. A still millipede is often one that is behaving as expected in a hidden, sheltered environment.

Humidity and substrate quality matter because dry, compacted, stagnant or unsuitable conditions can make a millipede less active. Equally, repeated digging or frequent checking can add stress and keep it hidden longer than usual.

If you want help judging whether the animal itself looks sound, our guide on How to Tell if a Millipede Is Healthy is the best next comparison.

What you can do next

If the millipede otherwise looks normal, leave it alone for a while and avoid repeated disturbance. Give the enclosure time to settle, then check again later when the room is quiet and dark.

If the stillness continues, work through the enclosure basics again and compare what you see with the symptoms in the linked troubleshooting guides above. If the animal is completely unresponsive, smells bad, looks damaged, or shows obvious signs of decline, treat it as a more serious problem and use the Millipede Troubleshooting Guide as your starting point.