A 42-year-old woman, from Porthcawl, Wales who went swimming in the sea and suffered severe earache later, thought she had a perforated eardrum or an infection.
Victoria Price, visited the accident and emergency unit, and the nurse who attended to her discovered a 'chunky'spider had crawled into her ear.
She pulled out the 'live, wriggly' creature, remarking that it was 'twice as big as it first looked'.
Fortunately an examination showed the spider had not caused any problems.
Mrs Price said: 'There was no further damage - or any eggs laid, as everyone keeps asking me.'
Mrs Price, an IT trainer with South Wales Police, had been swimming off Newton Beach, Porthcawl, when the furry spider is thought to have nestled itself inside her head.
'I got out of the shower [when I got home] and the pain in my ear was just incredible,' said Mrs Price.
'I was Irish dancing around the bathroom. I didn't know what to do with myself.
'I assumed I had trapped water or I'd perforated an eardrum or something.
'The first thing I did was reach for cotton wool, because you think if it's water that will absorb it.
'As soon as I put the cotton wool in it was quite a bit better but throughout the night it came and went. I didn't sleep very much.'