If your cofounder is struggling with depression, name what you have actually noticed, not a diagnosis. Ask directly and privately, point them toward a professional who can help, and separate that from the business decisions you still need to make together. You are not their doctor, and treating them as a problem to manage costs you the partnership too.
This is not a guide to diagnosing anyone. Depression is a medical condition, and the only people qualified to assess and treat it are doctors and licensed therapists. What follows is what a cofounder can reasonably do: notice, ask, support the decision to get help, and keep the business steady while they do.
What should you actually be watching for?
A pattern that holds for weeks, not a bad week. Stress spikes around a deadline and eases once it passes. What is worth taking seriously looks different: flat mood most days regardless of what is happening at work, losing interest in parts of the job they used to care about, sleeping noticeably more or less than usual, and pulling back from conversations and decisions they would normally be in the middle of. A survey of entrepreneurs by Founder Reports found that most respondents were not even aware mental health resources tailored to founders existed, according to its research on entrepreneur mental health, which is part of why this often goes unaddressed longer than it should.
How do you actually bring it up?
Directly, privately, and not in the middle of a deadline. Describe what you have noticed in specific terms rather than a label: fewer messages than usual, missed calls, a flatness that was not there a month ago. Ask how they are doing and mean it. Pick a time when neither of you is rushing to the next thing, and be ready to just listen instead of jumping to a fix.
Avoid two common mistakes:
- Framing it as a performance issue first. Even if their output has genuinely dropped, leading with that reads as pressure, not concern.
- Trying to diagnose or treat it yourself. You can encourage them toward a doctor or therapist. You cannot be one.
What is yours to carry, and what is not?
Yours: covering urgent work, resetting deadlines honestly instead of pretending nothing changed, and being straightforward about what the company actually needs over the next few weeks. Not yours: fixing the underlying condition, which is a medical matter between your cofounder and a professional, not something either of you can solve in a founder conversation.
This split matters because trying to do both at once usually fails at both. A cofounder who takes on an informal therapist role on top of running the business tends to burn out themselves within a few months, while the actual support their cofounder needed never arrived. If covering their work is quietly reshaping your own role, that is worth naming too; see how burnout capacity fuels cofounder conflict for how an unequal load builds resentment even with the best intentions on both sides.
When does this become a business decision, not just a personal one?
When it starts affecting commitments to the team, customers, or investors. At that point, decide together what needs to change, temporarily or otherwise, and say it plainly to whoever needs to know, without sharing private medical detail. If the two of you cannot agree on what the business needs right now, a Conflict Session gives you a structured way to work through that disagreement, separate from the health question itself, so neither gets stuck waiting on the other. For the signs a wider pattern is forming, see when a cofounder is quietly checked out.
If you or your cofounder are in crisis or thinking about self-harm, contact a doctor, a mental health professional, or emergency services in your country right away. This is not something to wait out.
Frequently asked questions
- What are signs a cofounder might be depressed, not just stressed?
- Stress usually tracks a deadline and eases once it passes. Depression sits underneath everything for weeks: flat mood most days, losing interest in work they used to care about, sleeping far more or less, and pulling away from conversations they would normally have had. A bad quarter that does not lift is different from a bad week.
- How do I bring up my concern without making it worse?
- Say what you have actually noticed, in specific terms, not a diagnosis. Something like naming the pattern you have seen over recent weeks and asking how they are doing, genuinely. Ask when you are not mid-crisis and have time to actually listen. Avoid framing it as a performance problem, even if their output has dropped.
- Is it my job to help my cofounder through depression?
- Part of it, not all of it. You can notice, ask, and point them toward professional support. Treating it is not your job, and trying to can hurt both of you. Where you do have real standing is the business: covering urgent work, resetting deadlines honestly, and being clear about what the company needs regardless of the cause.
- Should we tell investors or the team if a cofounder is struggling?
- Tell your team and investors what affects their work, not private medical detail. If deadlines move or a role shifts temporarily, say that plainly, without naming the cause unless your cofounder chooses to. What matters to a team or an investor is whether the business has a plan, not the specifics of anyone's health.