Facial Paralysis: If you have facial paralysis or other muscle disorder, then it could also cause a delay in physical emotional expression.More often than not, flat affect may manifest itself alongside anhedonia.

Depression: If you’re living on the depression spectrum, then you are likely to struggle with flat affect.

Dementia: Dementia is a disorder that can cause changes in the frontal and temporal lobes of the brain, which can cause flat affect in dementia patients.

Autism: Autistic people may also struggle with flat affect and respond to social interactions.

Antidepressants: Certain medications can cause flat affect as evidenced in a 2017 study where more than 3000 participants were reviewed.

While flat affect is commonly linked with schizophrenia, there might be other causes of flat affect as well. While there may be a lack of evidence to prove what exactly causes flat affect, researchers believe that your brain’s chemical imbalance may be a contributing factor.

Indifferent body language, gestures, or body cues.Some common signs of flat affect can include: I mean, imagine what your loved ones would feel if they threw you a surprise party and instead of meeting with a pleasantly shocked and excited reaction, they’re met with a bored or indifferent one?

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