What symptoms show that Craig's depression is really serious?

Craig's depression may be considered serious if he experiences persistent feelings of hopelessness and worthlessness, a significant loss of interest in activities he once enjoyed, and difficulty functioning in daily life. Additionally, if he exhibits changes in appetite or sleep patterns, increased irritability, or thoughts of self-harm or suicide, these are concerning indicators of a severe condition. It's important for him to seek professional help if these symptoms are present.