r/MCAS
Founded January 2013 · Public — anyone can post
A science-focused sub for Mast Cell Activation Disorders. Please note: The content on this subreddit is not intended as, and is not a substitute for, medical advice or diagnosis. It must not be interpreted as such. You are strongly advised to consult your own qualified healthcare professionals for any medical questions or concerns.
Members
57,449
57K
Online now
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not captured in the last snapshot
Posts per day
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no sample yet
Comments per post
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no sample yet
Growth · 7d
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not enough history yet
Growth · 30d
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not enough history yet
Promo tolerance
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not assessed yet
Last post
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no sample yet
Distinct posters
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no sample yet
Tracking since Sep 1 · growth spans are the real distance between snapshots, not rounded windows. Posts/day is measured from the community’s own newest posts on Reddit, not from what Prowlo happens to crawl.
Member growth
Similar by content
Communities that discuss what r/MCAS discusses.
A place of support for those living with, or affected by, chronic illness. Open and welcoming to all. This subreddit is for social and community support, not medical advice. If you need help please contact mod mail with a link to the content you need help with or have questions about.
Having a medical issue? Ask a doctor or medical professional on Reddit! All flaired medical professionals on this subreddit are verified by the mods.
**Discussing or sharing medication sources is not allowed and will result in a permanent ban from the sub** A place to discuss medication and share personal experiences. Nobody here is your medical professional and nothing posted or commented here is medical advice. The sub is for users to share and discuss experiences and knowledge. Never take anything you read here as medical advice and always consult your doctor.
Discussion and support for sufferers and loved ones with anxiety conditions. Please look over the rules before posting to the subreddit.
See the full lists on similar subreddits.
r/MCAS — frequently asked
How many members does r/MCAS have?
r/MCAS has 57,449 members as of our most recent crawl on Sep 20. Prowlo re-checks tracked communities on a rolling schedule, so this figure moves rather than sitting frozen at whatever it was when a scraper last ran.
Is r/MCAS growing?
We don't have 30 days of snapshot history for r/MCAS yet, so we're not going to invent a growth number. We've been tracking it since Sep 1; the chart fills in as history accumulates.
How active is r/MCAS?
We don't have a reliable posting-rate sample for r/MCAS yet. Subscriber count alone is a poor guide to whether a community is active, so treat this one as unverified until the next sample lands.
When was r/MCAS created?
r/MCAS was founded in January 2013 and is a public — anyone can post community. Age matters: an older community with steady growth has survived Reddit's moderation churn; a young one with a spike may not.
Can I promote my product in r/MCAS?
We don't have a promo-tolerance read for r/MCAS yet. Default to the safe approach: read the sidebar rules, contribute in threads where you gain nothing, and mention your product only when it is the honest answer to someone's question.
How do I monitor r/MCAS for mentions?
Hit Watch on this page. Prowlo starts crawling r/MCAS into your Dataset — every new post indexed and embedded, searchable semantically, queryable by your AI agent over MCP, and able to trigger keyword alerts in Slack. Prowlo is read-only; it never posts on your behalf.
Can my AI agent read r/MCAS's stats?
Yes. Everything on this page is one MCP tool call away: catalog_get_subreddit returns r/MCAS's members, growth, promo tolerance and similar communities as typed JSON — free, no credits. Connect your agent to api.prowlo.com/mcp and it can vet the community and start watching it in the same conversation.
Read-only · Human-in-the-loop
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