Ever wondered: “Why do my legs shake after sex?”

It’s not just you.

There are many terms for it:Orgasm.

Two people holding hands on a bed, suggesting intimacy and connection

But occasionally, some unexpected stuff can occur, like sudden headaches, sneezing or crying.

And the data researchers do have is based onsmall sample sizes.)

Below are just a few of the surprising things that can happen when you have an orgasm.

Person lying on a bed with hands covering face, conveying distress or contemplation

You might get a headache.

A burst of pleasure and then ugh the pain of a splitting headache.

Post-orgasm headaches are more common in men and among people who suffer frommigraines,according to the Mayo Clinic.

Close-up of a distraught person with tears and hands covering their mouth

So its best to check with a doctor to rule out something more serious.

Youre basking in that post-orgasm glow, and then suddenly tears are streaming down your face.

And you could rest assured knowing that its fairly common.

Woman with hair in buns, yellow top, laughing with hands on head against pink background

This is known as postcoital dysphoria, sex therapistVanessa Marintold HuffPost.

A fair number of people report feeling sad, overwhelmed, tearful or emotional after an orgasm.

Some survivors ofsexual trauma may experience postcoital dysphoria, even after good sex.

Person pulling tissue from a box, possibly related to dealing with emotional moments in relationships

[A therapist] can work towards understanding these feelings and where they are coming from.

You might feel totally euphoric.

Its no secret: Orgasmsgenerally feel pretty great.

Two people hugging knees, lying on bed, one with floral tattoo on right thigh

But for certain people, the positive post-sex feelings are particularly heightened.

For some people, the euphoric feelings seem extra-intense, Marin said.

Their mood is greatly improved, they feel more positive, and their self-esteem is elevated.

Person in bed looking at a thermometer, appearing unwell

Again, we dont quite know why orgasms can trigger such different reactions in different people.

We still dont know, Dr. Mahmood Bhutta an ear, nose and throat surgeon whostudied the phenomenontold Splinter.

Certain functions that are automatic get a bit confused in the brain.

You might have shaky legs.

Some women report leg shaking after they have an orgasm.

During climax,tension builds around our muscles, and not just those in the genital area.

When sex is over and the tension is released, some cramping, shaking or contractions can occur.

You might feel as if youre coming down with the flu.