"We have a growing recognition and a growing investment in conditions such as Alzheimer's, but conditions such as ME are not so readily recognised or invested in" says Ana Palazon, Chair of the Wales Neurological Alliance.
"We want parity and equity of recognition and services for all conditions."
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A 'Festival of Autism has been held in Swansea to raise awareness and help people understand the condition.
There will be some patchy cloud, especially in the west later, and the chance of an odd shower, but in the sunshine it will feel pleasant.
A runner who carried a fellow athlete over the London Marathon finishing line claimed helping was "more important" to him than his time.