"Gotten sick" is a common phrase used to describe the onset of illness or a disease. However, there are several synonyms that can be used to communicate the same idea to effectively convey the message. Some alternative expressions that can be used include 'become unwell', 'taken ill', 'fallen ill', 'come down with', 'contracted', 'developed', 'infected' or 'stricken with'. These variants can be used to provide a more descriptive context as per the situation that an individual is in. By using appropriate synonyms, we can make our writing and communication more effective while conveying the same meaning.