Rob Kardashian is acting strange -- on Twitter, anyway.
The reality star, 27, posted a cryptic tweet yesterday, saying: "no one will ever understand how much it hurts."
There was no further explanation.
Read: Khloe Kardashian Shows Off Weight Loss on Family Trip
He did post another disturbing message on Instagram, saying, "april fools prank: replace all the sugar in your house with cocaine." In addition, he deleted all his Instagram posts besides this one.
He also deleted a lot of his Twitter photos, leaving just one of his sock collection from Monday. Fans have been reaching out to Kardashian, offering their support.
Possibly unrelated, but publicized in magazines and on his show, Kardashian has been struggling with his weight and his health.
On Kardashian's 27th birthday on March 17, his big sister Khloe posted an Instagram collage of pictures when Rob was skinnier, with the caption "This year I want to give you the ability to see yourself through my eyes! I want you to own how incredible you are and shine the way you are meant to shine. I love you!!!"
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In addition to telling his very public battle with weight on "Keeping Up with the Kardashians," Rob has also been posting pictures while at the gym.
Kardashian's father Robert died in 2003 and his mother Kris Jenner is in Thailand right now with most of the family.
"Gorgeous Thailand @sprandoni @leah_jenner @brodyjenner @khloekardashian @kimkardashian @kendalljenner @kyliejenner #brucejenner #family #love #memories," she posted early this morning.