Solange opened up about the illness after she was forced to cancel a gig in South Africa. She was due to perform at the AfroPunk musical festival on New Year’s Eve.
Taking to Instagram, she profusely apologised to her fans in South Africa and explained the decision was "doctor's order".
The 31-year-old wrote: " The past five months I have been quietly treating, and working through an Autonomic Disorder. It been a journey that hasn’t been easy on me...
"Sometimes I feel cool, and other times not so cool at all. It’s a complicated diagnoses , and I’m still learning so much myself, but right now, my doctors are not clearing me for such an extended lengthy flight, and doing a rigorous show right after.
"I can’t put into words how saddened and sorry I am that I am unable to perform for you guys this NYE, there is simply no other place I wanted to be than there with my family to bring in 2018 with you..."
According to physicians at NYU Langone’s Dysautonomia Center, there are several different types of autonomic disorders. But the overall impact of the disorder is the body has difficulties regulating certain internal organ function; these can include your heart rate, or blood pressure, or digestion and/or body temperature.
And symptoms of the disorder include fainting, lightheadedness and fluctuating blood pressure.
Solange has yet to specifically reveal what type of nervous system disorder she is suffering with. Solange wrote in her Instagram post that she was "still not sure what exactly or how much I want to share".
But despite struggling with the disorder, Solange has told fans that she is determined to continue performing in 2018 .
She wrote: “As a part of the self-care that I’ve tried to encourage this past year, it needs to start with myself, and I’m looking forward to doing a better job of this 2018."
She added: “This past year has been one of the most fulfilling of my life… Performing this record and experiencing the energy exchange with you guys has been astounding, and I’m so excited about continuing to do the work I feel so absolutely humbled and appreciative to be doing next year. It gives me life.”
Solange has promised to make it up to her fans in South Africa. She said: "I give you my ABSOLUTE WORD I will come back with AfroPunk and deliver this performance."

Wrote, deleted and re wrote this like 5 times... Still not sure what exactly or how much I want to share... However it’s so important to me for the people in South Africa, a place that has tremendous meaning to me and that has given me SO SO MUCH, to know why I won’t be performing at Afro Punk this NYE. The past five months I have been quietly treating, and working through an Autonomic Disorder. It been a journey that hasn’t been easy on me... Sometimes I feel cool, and other times not so cool at all. It’s a complicated diagnoses , and I’m still learning so much myself, but right now, my doctors are not clearing me for such an extended lengthy flight, and doing a rigorous show right after. I can’t put into words how saddened and sorry I am that I am unable to perform for you guys this NYE, there is simply no other place I wanted to be than there with my family to bring in 2018 with you.......but I give you my ABSOLUTE WORD I will come back with AfroPunk and deliver this performance.....as it is so extremely important to me to connect with the people who have so closely inspired me in so many ways. I can’t thank Afro Punk enough for their support, and to all of the other festivals this past summer/fall who have known about my health, kept it confidential, and gone out of their way to make me feel supported while doing these shows. As a part of the self care that I’ve tried to encourage this past year, it needs to start with myself, and I’m looking forward to doing a better job of this 2018. This past year has been one of the most fulfilling of my life... Performing this record and experiencing the energy exchange with you guys has been astounding, and I’m so excited about continuing to do the work I feel so absolutely humbled and appreciative to be doing next year. It gives me life.

A post shared by Solange (@saintrecords) on Dec 27, 2017 at 8:33am PST