If you are not using the socioeconomics module, better to start a new database without that module. But if you can't, and you want to hide the socioeconomics tab, you can put something like this in a xml file of a custom module:
<record model="ir.ui.view" id="gnuhealth_patient_form_mycustomview">
<field name="model">gnuhealth.patient</field>
<field name="inherit" ref="health.gnuhealth_patient_view_form"/>
<field name="arch" type="xml">
<![CDATA[
<data>
<xpath
expr="/form/notebook/address@hidden"page_socioeconomics"]"
position="replace_attributes">
<page string="Socioeconomics" id="page_socioeconomics"
states="{'invisible': True}"/>
</xpath>
</data>
]]>
</field>
</record>