There were many features that significantly increased during COVID-19 for specific groups including the categories “economic stress,” “isolation,” and “home,” while others such as “motion” significantly decreased. Results: We found that the r/HealthAnxiety forum showed spikes in posts about COVID-19 early on in January, approximately 2 months before other support groups started posting about the pandemic. We applied unsupervised methods such as topic modeling and unsupervised clustering to uncover concerns throughout Reddit before and during the pandemic. Using supervised machine learning, we classified posts into their respective support groups and interpreted important features to understand how different problems manifest in language. Using regression, we analyzed trends from 90 text-derived features such as sentiment analysis, personal pronouns, and semantic categories. Methods: We created and released the Reddit Mental Health Dataset including posts from 826,961 unique users from 2018 to 2020. Objective: The aim of this study is to leverage natural language processing (NLP) with the goal of characterizing changes in 15 of the world’s largest mental health support groups (eg, r/schizophrenia, r/SuicideWatch, r/Depression) found on the website Reddit, along with 11 non–mental health groups (eg, r/PersonalFinance, r/conspiracy) during the initial stage of the pandemic. Online Journal of Public Health InformaticsġProgram in Speech and Hearing Bioscience and Technology, Harvard Medical School, Boston, MA, United StatesĢDepartment of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA, United StatesģMcGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA, United StatesĤCenter for Data Sciences, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United StatesĥDepartment of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, United StatesĦBroad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA, United StatesħDepartment of Biomedical Informatics, Harvard Medical School, Boston, MA, United StatesĨHuman Health and Performance Systems, Massachusetts Institute of Technology Lincoln Laboratory, Lexington, MA, United StatesĩDigital Psychiatry Division, Department of Psychiatry at Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United Statesġ0Thomas J Watson Research Center, IBM, Yorktown Heights, NY, United Statesġ1Department of Otolaryngology, Harvard Medical School, Boston, MA, United Statesĭepartment of Brain and Cognitive SciencesĮmail: The COVID-19 pandemic is impacting mental health, but it is not clear how people with different types of mental health problems were differentially impacted as the initial wave of cases hit.Asian/Pacific Island Nursing Journal 13 articles.JMIR Bioinformatics and Biotechnology 38 articles.JMIR Biomedical Engineering 70 articles.Journal of Participatory Medicine 80 articles.JMIR Perioperative Medicine 93 articles.JMIR Rehabilitation and Assistive Technologies 218 articles.JMIR Pediatrics and Parenting 297 articles.Interactive Journal of Medical Research 332 articles.JMIR Public Health and Surveillance 1219 articles.Journal of Medical Internet Research 7827 articles.
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