Alcoholism can show up differently in different people. However, some common signs indicating the possibility of underlying alcohol abuse include the following:   Frequent mood changes Losing interest in activities and hobbies in activities that they previously used to enjoy Changes in appetite Irregular sleep habits Hiding or lying about alcohol consumption Withdrawal from family and friends Experiencing memory loss or blackouts after consuming alcohol Increased irritability when not drinking alcohol Difficulty in fulfilling the responsibilities at work or home Experiencing withdrawal symptoms, such as anxiety, sweating, nausea, shakiness, depression, or restlessness once the effects of alcohol wear off