Nipples are weird and wonderful things; they go hard when you"re turned on and stick out like sore thumbs when you"re cold - and sometimes, just go hard for no apparent reason.

You are watching: What does it mean when a girls nipples are hard

Only it turns out there isa reason behind the often unpredictable erections (bet you"ve heard that one before), and it"s down to a highly specialised type of nerve cell that does nothing elseexceptgenerate nipple erections. Yep.

According to the journal of Nature Neuroscience, hard nipples are normally involuntary and are controlled by the sympathetic nervous system, which also coordinates and regulates all our other unconscious bodily functions.

The study"s co-author Alessando Furlan explained: "We"ve shown that the sympathetic system consists of many types of neuron that regulate specific functions in the body.

"For example, one thing we found was that goose bumps and nipple erection are caused by neurons that are specialized to regulate these functions by controlling the erectile muscles in these tissues."

Of course, being cold, breastfeeding and sexual arousal can also prompt your nipples to stick out, which might be down to how sensitive the area is, or the smooth muscle cells around the areolaecontractingwhen stimulated.

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Dusty Baxter-WrightSenior Entertainment & Lifestyle WriterDusty Baxter-Wright is"s Senior Entertainment and Lifestyle Writer, covering celebrities, movies, TV and books as well as travel, interiors, food and drink on a daily basis.
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